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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2017	Apr. 13, 2017
Document Information [Line Items]
Entity Registrant Name	SEI INVESTMENTS COMPANY
Entity Central Index Key	0000350894
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Trading Symbol	SEIC
Amendment Flag	false
Entity Common Stock, Shares Outstanding		158,709,804

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 661,372	$ 695,701
Restricted cash	3,500	3,500
Receivables from investment products	51,453	61,761
Receivables, net of allowance for doubtful accounts of $518 and $523	252,205	227,957
Securities owned	21,372	21,339
Other current assets	29,873	27,575
Total Current Assets	1,019,775	1,037,833
Property and Equipment, net of accumulated depreciation of $291,500 and $285,322	142,726	146,190
Capitalized Software, net of accumulated amortization of $315,512 and $303,540	300,756	295,867
Investments Available for Sale	89,262	84,033
Investments in Affiliated Funds, at fair value	5,156	4,858
Investment in Unconsolidated Affiliate	48,759	50,459
Deferred Income Taxes	1,878	2,127
Other Assets, net	16,240	15,456
Total Assets	1,624,552	1,636,823
Current Liabilities:
Accounts payable	7,372	5,966
Accrued liabilities	167,061	240,525
Deferred revenue	2,337	2,880
Total Current Liabilities	176,770	249,371
Deferred Tax Liabilities, Net	69,379	69,693
Other Long-term Liabilities	15,610	14,645
Total Liabilities	261,759	333,709
Commitments and Contingencies
SEI Investments shareholders' equity:
Common stock, $.01 par value, 750,000 shares authorized; 158,687 and 159,031 shares issued and outstanding	1,587	1,590
Capital in excess of par value	976,007	955,461
Retained earnings	420,712	384,018
Accumulated other comprehensive loss, net	(35,513)	(37,955)
Total Shareholders' Equity	1,362,793	1,303,114
Total Liabilities and Shareholders' Equity	$ 1,624,552	$ 1,636,823

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Receivables, allowance for doubtful accounts	$ 518	$ 523
Property and Equipment, accumulated depreciation	291,500	285,322
Capitalized Software, accumulated amortization	$ 315,512	$ 303,540
SEI Investments shareholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	158,687,000	159,031,000
Common stock, shares outstanding	158,687,000	159,031,000

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Asset management, administration and distribution fees	$ 278,565	$ 251,437
Information processing and software servicing fees	74,763	73,399
Transaction-based and trade execution fees	6,656	9,427
Total revenues	359,984	334,263
Expenses:
Subadvisory, distribution and other asset management costs	42,502	39,195
Software royalties and other information processing costs	7,662	7,748
Brokerage commissions	4,959	7,108
Compensation, benefits and other personnel	108,943	101,931
Stock-based compensation	6,180	3,789
Consulting, outsourcing and professional fees	43,149	38,506
Data processing and computer related	16,772	15,718
Facilities, supplies and other costs	17,478	15,997
Amortization	12,022	11,012
Depreciation	6,800	6,447
Total expenses	266,467	247,451
Income from operations	93,517	86,812
Net gain (loss) from investments	347	(126)
Interest and dividend income	1,343	1,083
Interest expense	(112)	(114)
Equity in earnings of unconsolidated affiliate	33,565	29,192
Gain on sale of subsidiary	0	2,791
Income before income taxes	128,660	119,638
Income taxes	$ 39,923	$ 42,141
Basic earnings per common share	$ 0.56	$ 0.48
Net income	$ 88,737	$ 77,497
Shares used to compute basic earnings per share	159,091	163,013
Diluted earnings per common share	$ 0.55	$ 0.47
Shares used to compute diluted earnings per share	162,742	166,145

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 88,737	$ 77,497
Other comprehensive gain, net of tax:
Foreign currency translation adjustments	2,488	2,429
Unrealized (loss) gain on investments:
Unrealized (losses) gains during the period, net of income taxes of $19 and $(191)	(24)	330
Less: reclassification adjustment for (gains) losses realized in net income, net of income taxes of $10 and $(103)	(22)	187
Unrealized (loss) gain on investments:	(46)	517
Total other comprehensive gain, net of tax	2,442	2,946
Comprehensive income	$ 91,179	$ 80,443

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Unrealized (losses) gains during the period, income tax benefit (expense)	$ 19	$ (191)
Reclassification adjustment for (gains) losses realized in net income, income tax expense (benefit)	$ 10	$ (103)

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 88,737	$ 77,497
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1)	(15,725)	1,148
Net cash provided by operating activities	73,012	78,645
Cash flows from investing activities:
Additions to property and equipment	(3,205)	(4,609)
Additions to capitalized software	(16,861)	(9,477)
Purchases of marketable securities	(20,445)	(8,652)
Prepayments and maturities of marketable securities	15,166	12,090
Sales of marketable securities	0	185
Receipt of contingent payment from sale of SEI AK	0	2,791
Other investing activities	0	200
Net cash used in investing activities	(25,345)	(7,472)
Cash flows from financing activities:
Purchase and retirement of common stock	(56,553)	(78,372)
Proceeds from issuance of common stock	16,847	6,476
Payment of dividends	(44,597)	(42,677)
Net cash used in financing activities	(84,303)	(114,573)
Effect of exchange rate changes on cash and cash equivalents	2,307	1,992
Net decrease in cash and cash equivalents	(34,329)	(41,408)
Cash and cash equivalents, beginning of period	695,701	679,661
Cash and cash equivalents, end of period	$ 661,372	$ 638,253

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Nature of Operations

SEI Investments Company (the Company), a Pennsylvania corporation, provides investment processing, investment management, and investment operations solutions to financial institutions, financial advisors, institutional investors, investment managers and ultra-high-net-worth families in the United States, Canada, the United Kingdom, continental Europe and various other locations throughout the world. Investment processing solutions consist of application and business process outsourcing services, professional services and transaction-based services. Revenues from investment processing solutions are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations, except for fees earned associated with trade execution services which are recognized in Transaction-based and trade execution fees.

Investment management programs consist of mutual funds, alternative investments and separate accounts. These include a series of money market, equity, fixed-income and alternative investment portfolios, primarily in the form of registered investment companies. The Company serves as the administrator and investment advisor for many of these products. Revenues from investment management programs are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Investment operations solutions offer investment managers support for traditional investment products such as mutual funds, collective investment trusts, exchange-traded funds, and institutional and separate accounts, by providing outsourcing services including fund and investment accounting, administration, reconciliation, investor servicing and client reporting. These solutions also provide support to managers focused on alternative investments who manage hedge funds, funds of hedge funds, private equity funds and real estate funds, across registered, partnership and separate account structures domiciled in the United States and overseas. Revenues from investment operations solutions are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations.

Basis of Presentation

The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America. Certain financial information and accompanying note disclosure normally included in the Company’s Annual Report on Form 10-K have been condensed or omitted. The interim financial information is unaudited but reflects all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of financial position of the Company as of March 31, 2017, the results of operations for the three months ended March 31, 2017 and 2016, and cash flows for the three-month periods ended March 31, 2017 and 2016. These interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.

There have been no significant changes in significant accounting policies during the three months ended March 31, 2017 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 with the exception of the adoption of Accounting Standards Update (ASU) 2016-09, Improvements to Employee Share-Based Payment Accounting (ASU 2016-09). As required by ASU 2016-09, excess tax benefits recognized on stock-based compensation expense are reflected in the accompanying Consolidated Statements of Operations as a component of the provision for income taxes on a prospective basis (See Note 11). Additionally, excess tax benefits or deficiencies recognized on stock-based compensation expense are classified as an operating activity in the accompanying Consolidated Statements of Cash Flows. The Company has applied this provision retrospectively for the periods prior to the date of adoption. As a result, for the three months ended March 31, 2016, net cash provided by operating activities increased by $624 with a corresponding offset to net cash used for financing activities.

ASU 2016-09 also allows for the option to account for forfeitures as they occur when determining the amount of compensation cost to be recognized, rather than estimating expected forfeitures over the course of a vesting period. The Company elected to account for forfeitures as they occur. In addition, ASU 2016-09 eliminates anticipated windfalls and shortfalls that were included in the calculation of assumed proceeds for computing the dilutive effect of share-based payment awards in the calculation of diluted earnings per share. No adjustments to the Company's prior period reported diluted earnings per share amounts were permitted by ASU 2016-09.

The net cumulative effect to the Company from the adoption of ASU 2016-09 was an increase to paid-in capital of $2,582, a reduction to retained earnings of $1,669 and an increase to deferred tax assets of $913 as of January 1, 2017.

Cash and Cash Equivalents

Cash and cash equivalents includes $313,762 and $374,760 at March 31, 2017 and December 31, 2016, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds. The SEI-sponsored mutual funds are Level 1 assets.

Restricted Cash

Restricted cash includes $3,000 at March 31, 2017 and December 31, 2016 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $500 at March 31, 2017 and December 31, 2016, respectively, segregated in special reserve accounts for the benefit of customers of the Company’s broker-dealer subsidiary, SEI Investments Distribution Co. (SIDCO), in accordance with certain rules established by the Securities and Exchange Commission for broker-dealers.

Capitalized Software

The Company capitalized $16,861 and $9,477 of software development costs during the three months ended March 31, 2017 and 2016, respectively. The Company's software development costs primarily relate to the continued development of the SEI Wealth Platform^SM(the Platform). The Company capitalized $15,178 and $7,645 of software development costs for significant enhancements to the Platform during the three months ended March 31, 2017 and 2016, respectively. As of March 31, 2017, the net book value of the Platform was $283,565. The Platform has an estimated useful life of 15 years and a weighted average remaining life of 5.2 years. Amortization expense for the Platform was $11,972 and $10,955 during the three months ended March 31, 2017 and 2016, respectively.

The Company also capitalized $1,683 and $1,832 of software development costs during the three months ended March 31, 2017 and 2016, respectively, related to an application for the Investment Managers segment. Capitalized software development costs in-progress at March 31, 2017 associated with the application were $17,191. The application is not yet ready for use.

Earnings per Share

The calculations of basic and diluted earnings per share for the three months ended March 31, 2017 and 2016 are:



	Three Months Ended March 31,
	2017		2016
Net income	$	88,737	$	77,497
Shares used to compute basic earnings per common share	159,091,000		163,013,000
Dilutive effect of stock options	3,651,000		3,132,000
Shares used to compute diluted earnings per common share	162,742,000		166,145,000
Basic earnings per common share	$	0.56	$	0.48
Diluted earnings per common share	$	0.55	$	0.47

During the three months ended March 31, 2017 and 2016, employee stock options to purchase 11,279,000 and 10,506,000 shares of common stock with an average exercise price of $37.70 and $34.05, respectively, were outstanding but not included in the computation of diluted earnings per common share. These options for the three month periods were not included in the computation of diluted earnings per common share because either the performance conditions have not been satisfied or would have been satisfied if the reporting date was the end of the contingency period or the option’s exercise price was greater than the average market price of the Company’s common stock and the effect on diluted earnings per common share would have been anti-dilutive.

Reclassifications

Certain prior year amounts have been reclassified to conform to current year presentation.

Statements of Cash Flows

For purposes of the Consolidated Statements of Cash Flows, the Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents.

The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the three months ended March 31:



	2017			2016
Net income	$	88,737		$	77,497
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,800			6,447
Amortization	12,022			11,012
Equity in earnings of unconsolidated affiliate	(33,565		)	(29,192		)
Distributions received from unconsolidated affiliate	35,265			34,525
Stock-based compensation	6,180			3,789
Provision for losses on receivables	(5		)	51
Deferred income tax expense	877			(1,029		)
Gain from sale of SEI AK	—			(2,791		)
Net (gain) loss from investments	(347		)	126
Tax benefit on stock options exercised (1)	—			624
Change in other long-term liabilities	965			279
Change in other assets	(849		)	1,099
Other	56			676
Change in current asset and liabilities
Decrease (increase) in
Receivables from investment products	10,308			(3,535		)
Receivables	(24,243		)	(6,585		)
Other current assets	(2,298		)	(2,622		)
Increase (decrease) in
Accounts payable	1,406			(157		)
Accrued liabilities	(27,754		)	(12,120		)
Deferred revenue	(543		)	551
Total adjustments	(15,725		)	1,148
Net cash provided by operating activities	$	73,012		$	78,645

(1) The tax benefit on stock options exercised for the three months ended March 31, 2016 was reclassified to operating activities from financing activities upon the adoption of ASU 2016-09.

New Accounting Pronouncements

On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (ASU 2014-09), requiring an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The updated standard permits the use of either the retrospective or cumulative effect transition method. The FASB has recently issued several amendments to the standard, including principal versus agent guidance and identifying performance obligations. ASU 2014-09 currently becomes effective for the Company during the first quarter 2018.

The Company continues to assess the impact ASU 2014-09 will have on its revenue arrangements with completion, including selecting a transition method, expected by the third quarter of 2017. The majority of the Company’s services are bundled together and provided and completed for the client on a monthly basis. The Company expects revenue for these services to continue to be recognized monthly because of the continuous transfer of control to the client. Therefore, the adoption of this ASU is not expected to have a material impact on the recognition of revenue for the majority of the fees recognized for the services provided. However, the Company believes the adoption of the new standard may affect the timing of the recognition of implementation fees recognized in Information processing and software servicing fees as well as fund conversion fees and other ancillary fees recognized in Asset management, administration and distribution fees. Transaction-based and trade execution fees are based on current period activity and is not expected to be affected by the adoption of ASU 2014-09. Due to the complexity of some of our agreements, the actual revenue recognition treatment required under the standard will be dependent on contract-specific terms, and certain aspects may vary in some instances from recognition ratably over the contract term.

The new standard also modified some of the principal and agent considerations which may result in changes to gross or net treatment of revenue and expenses but would not affect final net income. The Company is also evaluating its sales commission programs affected by the standard. Previously, sales commission costs were expensed at inception of a sales agreement but under the new standard will generally need to be capitalized and amortized over the period of contract performance.

The new standard provides companies with alternative methods of adoption and the Company is in the process of determining the method of adoption, which depends in part upon completion of the evaluation of the remaining revenue arrangements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (ASU 2016-02) requiring lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. For lessees, leases will continue to be classified as either operating or finance leases in the income statement. Lessor accounting is similar to the current model but updated to align with certain changes to the lessee model. Lessors will continue to classify leases as operating, direct financing or sales-type leases. The new standard must be adopted using a modified retrospective transition and requires application of the new guidance at the beginning of the earliest comparative period presented. The updated standard is effective for the Company beginning in the first quarter of 2019. Early adoption is permitted. The Company is currently evaluating the transition method that will be elected and the effect that the updated standard will have on its consolidated financial statements and related disclosures.

Investment In Unconsolidated Affiliate

3 Months Ended

Mar. 31, 2017

Equity Method Investments and Joint Ventures [Abstract]

Investment In Unconsolidated Affiliate

Investment in Unconsolidated Affiliate

LSV Asset Management

The Company has an investment in LSV Asset Management (LSV), a registered investment advisor that provides investment advisory services primarily to institutions, including pension plans and investment companies. LSV is currently an investment sub-advisor for a limited number of SEI-sponsored mutual funds. The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations.

At March 31, 2017, the Company’s total investment in LSV was $48,759. The Company receives partnership distributions from LSV on a quarterly basis. The Company received partnership distributions from LSV of $35,265 and $34,525 in the three months ended March 31, 2017 and 2016, respectively.

The Company’s proportionate share in the earnings of LSV was $33,565 and $29,192 during the three months ended March 31, 2017 and 2016, respectively.

These tables contain condensed financial information of LSV:



Condensed Statement of Operations	Three Months Ended March 31,
	2017		2016
Revenues	$	109,953	$	92,653
Net income	86,215		74,457



Condensed Balance Sheets	March 31, 2017		December 31, 2016
Current assets	$	121,189	$	125,872
Non-current assets	1,782		1,927
Total assets	$	122,971	$	127,799

Current liabilities	$	40,506	$	39,303
Partners’ capital	82,465		88,496
Total liabilities and partners’ capital	$	122,971	$	127,799

In April 2016, LSV provided an interest in the partnership to select key employees which reduced the ownership percentage of each existing partner on a pro-rata basis. As a result, the Company's total partnership interest in LSV was reduced from approximately 39.2 percent to approximately 38.9 percent.

Guaranty Agreement with LSV Employee Group III

In October 2012, LSV Employee Group III purchased a portion of the partnership interest of three existing LSV employees for $77,700, of which $69,930 was financed through two syndicated term loan facilities contained in a credit agreement with The PrivateBank and Trust Company. The Company provided an unsecured guaranty for $45,000 of the obligations of LSV Employee Group III to the lenders through a guaranty agreement. The lenders have the right to seek payment from the Company in the event of a default by LSV Employee Group III. LSV agreed to provide an unsecured guaranty for $24,930 of the obligations of LSV Employee Group III to the lenders through a separate guaranty agreement.

The Company’s direct interest in LSV was unchanged as a result of this transaction. The Company has determined that LSV Employee Group III is a variable interest entity (VIE); however, the Company is not considered the primary beneficiary because it does not have the power to direct the activities that most significantly impact the economic performance of LSV Employee Group III either directly or through any financial responsibility from the guaranty.

In September 2014, LSV Employee Group III made the final principal payment related to the term loan guaranteed by LSV. As of April 13, 2017, the remaining unpaid principal balance of the term loan guaranteed by the Company was $1,065. LSV Employee Group III has met all financial obligations to date regarding the scheduled repayment of the term loans since origination. The Company, in its capacity as guarantor, currently has no obligation of payment relating to the term loan of LSV Employee Group III and, furthermore, fully expects that LSV Employee Group III will meet all of their future obligations regarding the term loan.

Variable Interest Entities - Investment Products	3 Months Ended
Variable Interest Entities - Investment Products	Mar. 31, 2017
Financial Support for Nonconsolidated Legal Entity [Abstract]
Variable Interest Entities - Investment Products	Variable Interest Entities – Investment Products The Company or its affiliates have created numerous investment products for its clients in various types of legal entity structures. The Company serves as the Manager, Administrator and Distributor for these investment products and may also serve as the Trustee for some of the investment products. The Company receives asset management, distribution, administration and custodial fees for these services. Clients are the equity investors and participate in proportion to their ownership percentage in the net income or loss and net capital gains or losses of the products, and, on liquidation, will participate in proportion to their ownership percentage in the remaining net assets of the products after satisfaction of outstanding liabilities. The Company has concluded that it is not the primary beneficiary of the entities and; therefore, is not required to consolidate any of the pooled investment vehicles for which it receives asset management, distribution, administration and custodial fees under the VIE model. The entities either do not meet the definition of a VIE or the Company does not hold a variable interest in the entities. The entities either qualify for the money market scope exception, or are entities in which the Company’s asset management, distribution, administration and custodial fees are commensurate with the services provided and include fair terms and conditions, or are entities that are limited partnerships which have substantive kick-out rights. The Company acts as a fiduciary and does not hold any other interests other than insignificant seed money investments in the pooled investment vehicles. For this reason, the Company also concluded that it is not required to consolidate the pooled investment vehicles under the VOE model. The Company is a party to expense limitation agreements with certain SEI-sponsored money market funds subject to Rule 2a-7 of the Investment Company Act of 1940 which establish a maximum level of ordinary operating expenses incurred by the fund in any fiscal year including, but not limited to, fees of the administrator or its affiliates. Under the terms of these agreements, the Company waived $7,072 and $12,477 in fees during the three months ended March 31, 2017 and 2016, respectively.

Composition of Certain Financial Statement Captions

3 Months Ended

Mar. 31, 2017

Items Included in Consolidated Statement of Financial Condition [Abstract]

Composition of Certain Financial Statement Captions

Receivables

Receivables on the accompanying Consolidated Balance Sheets consist of:



	March 31, 2017			December 31, 2016
Trade receivables	$	54,973		$	48,683
Fees earned, not billed	186,894			168,971
Other receivables	10,856			10,826
	252,723			228,480
Less: Allowance for doubtful accounts	(518		)	(523		)
	$	252,205		$	227,957

Fees earned, not billed represents receivables earned but unbilled and results from timing differences between services provided and contractual billing schedules. These billing schedules generally provide for fees to be billed on a quarterly basis. In addition, certain fees earned from investment operations services are calculated based on assets under administration that have a prolonged valuation process which delays billings to clients.

Receivables from investment products on the accompanying Consolidated Balance Sheets primarily represent fees receivable for distribution, investment advisory, and administration services to various regulated investment companies and other investment products sponsored by SEI.

Property and Equipment

Property and Equipment on the accompanying Consolidated Balance Sheets consists of:



	March 31, 2017			December 31, 2016
Buildings	$	152,171		$	152,171
Equipment	108,010			106,759
Land	10,030			10,030
Purchased software	128,377			128,008
Furniture and fixtures	17,407			17,292
Leasehold improvements	15,433			15,175
Construction in progress	2,798			2,077
	434,226			431,512
Less: Accumulated depreciation	(291,500		)	(285,322		)
Property and Equipment, net	$	142,726		$	146,190

The Company recognized $6,800 and $6,447 in depreciation expense related to property and equipment for the three months ended March 31, 2017 and 2016, respectively.

Accrued Liabilities

Accrued liabilities on the accompanying Consolidated Balance Sheets consist of:



	March 31, 2017		December 31, 2016
Accrued employee compensation	$	25,949	$	79,735
Accrued consulting, outsourcing and professional fees	29,199		24,428
Accrued sub-advisory, distribution and other asset management fees	34,936		41,666
Accrued dividend payable	—		44,596
Accrued income taxes	36,524		3,721
Other accrued liabilities	40,453		46,379
Total accrued liabilities	$	167,061	$	240,525

Fair Value Measurements

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

The fair value of the Company’s financial assets and liabilities, except for the Company's investment funds sponsored by LSV, is determined in accordance with the fair value hierarchy. The fair value of the Company’s Level 1 financial assets consist mainly of investments in open-ended mutual funds that are quoted daily. Level 2 financial assets consist of Government National Mortgage Association (GNMA) mortgage-backed securities held by the Company's wholly-owned limited purpose federal thrift subsidiary, SEI Private Trust Company (SPTC), Federal Home Loan Bank (FHLB) and other U.S. government agency short-term notes held by SIDCO. The financial assets held by SIDCO were purchased as part of a cash management program requiring only short term, top-tier investment grade government and corporate securities. The financial assets held by SPTC are debt securities issued by GNMA and are backed by the full faith and credit of the U.S. government. These securities were purchased for the sole purpose of satisfying applicable regulatory requirements and have maturity dates which range from 2020 to 2041.

The fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets.

The valuation of the Company's Level 2 financial assets held by SIDCO and SPTC are based upon securities pricing policies and procedures utilized by third-party pricing vendors.

The pricing policies and procedures applied during the three months ended March 31, 2017 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2016. The Company had no Level 3 financial assets or liabilities at March 31, 2017 or December 31, 2016. There were no transfers of financial assets between levels within the fair value hierarchy during the three months ended March 31, 2017.

The fair value of certain financial assets and liabilities of the Company was determined using the following inputs:



			Fair Value Measurements at the End of the Reporting Period Using
Assets	March 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Equity available-for-sale securities	$	9,900	$	9,900	$	—
Fixed-income available-for-sale securities	79,362		—		79,362
Fixed-income securities owned	21,372		—		21,372
Investment funds sponsored by LSV (1)	5,156
	$	115,790	$	9,900	$	100,734



			Fair Value Measurements at the End of the Reporting Period Using
Assets	December 31, 2016		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Equity available-for-sale securities	$	9,581	$	9,581	$	—
Fixed-income available-for-sale securities	74,452		—		74,452
Fixed-income securities owned	21,339		—		21,339
Investment funds sponsored by LSV (1)	4,858
	$	110,230	$	9,581	$	95,791

(1) The fair value amounts presented in the tables above are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the accompanying Consolidated Balance Sheets (See Note 6).

Marketable Securities

3 Months Ended

Mar. 31, 2017

Marketable Securities [Abstract]

Marketable Securities

Investments Available for Sale

Investments available for sale classified as non-current assets consist of:



	At March 31, 2017
	Cost Amount		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	7,325	$	61	$	(817	)	$	6,569
Equities and other mutual funds	3,224		107		—			3,331
Debt securities	79,923		—		(561		)	79,362
	$	90,472	$	168	$	(1,378	)	$	89,262



	At December 31, 2016
	Cost Amount		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	7,357	$	24	$	(996	)	$	6,385
Equities and other mutual funds	2,968		228		—			3,196
Debt securities	74,843		—		(391		)	74,452
	$	85,168	$	252	$	(1,387	)	$	84,033

Net unrealized losses at March 31, 2017 and December 31, 2016 were $882 (net of income tax benefit of $328) and $836 (net of income tax benefit of $299), respectively. These net unrealized losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets.

There were gross realized gains of $261 and gross realized losses of $229 from available-for-sale securities during the three months ended March 31, 2017. There were gross realized gains of $13 and gross realized losses of $303 from available-for-sale securities during the three months ended March 31, 2016. Gains and losses from available-for-sale securities, including amounts reclassified from accumulated comprehensive income, are reflected in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations.

Investments in Affiliated Funds

The Company has an investment in funds sponsored by LSV. The Company records this investment on the accompanying Consolidated Balance Sheets at fair value. Unrealized gains and losses from the change in fair value of these funds are recognized in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations.

The investment primarily consists of U.S. dollar denominated funds that invest primarily in securities of Canadian, Australian and Japanese companies as well as various other global securities. The underlying securities held by the funds are translated into U.S. dollars within the funds. The funds had a fair value of $5,156 and $4,858 at March 31, 2017 and December 31, 2016, respectively. The Company recognized gains of $298 and $144 during the three months ended March 31, 2017 and 2016, respectively, from the change in fair value of the funds.

Securities Owned

The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings. The securities had a fair value of $21,372 and $21,339 at March 31, 2017 and December 31, 2016, respectively. There were no material net gains or losses from the change in fair value of the securities during the three months ended March 31, 2017 and 2016.

Lines of Credit	3 Months Ended
Lines of Credit	Mar. 31, 2017
Line of Credit Facility [Abstract]
Lines of Credit	Line of Credit The Company has a five-year $300,000 Credit Agreement (the Credit Facility) with Wells Fargo Bank, National Association, and a syndicate of other lenders. The Credit Facility is scheduled to expire in June 2021, at which time any aggregate principal amount of loans outstanding becomes payable in full. Any borrowings made under the Credit Facility will accrue interest at rates that, at the Company's option, are based on a base rate (the Base Rate) plus a premium that can range from 0.25 percent to 1.00 percent or the London InterBank Offered Rate (LIBOR) plus a premium that can range from 1.25 percent to 2.00 percent depending on the Company’s Leverage Ratio (a ratio of consolidated indebtedness to consolidated EBITDA for the four preceding fiscal quarters, all as defined in the related agreement). The Base Rate is defined as the highest of a) the Federal Funds Rate, as published by the Federal Reserve Bank of New York, plus 0.50 percent, b) the prime commercial lending rate of Wells Fargo, c) the applicable LIBOR plus 1.00 percent, or d) 0 percent. The Company also pays quarterly commitment fees based on the unused portion of the Credit Facility. The quarterly fees for the Credit Facility can range from 0.15 percent of the amount of the unused portion to 0.30 percent, depending on the Company’s Leverage Ratio. Certain wholly-owned subsidiaries of the Company have guaranteed the obligations of the Company under the agreement. The aggregate amount of the Credit Facility may be increased by an additional $100,000 under certain conditions set forth in the agreement. The Credit Facility contains covenants that restrict the ability of the Company to engage in mergers, consolidations, asset sales, investments, transactions with affiliates, or to incur liens, as defined in the agreement. In the event of a default under the Credit Facility, the Company would also be restricted from paying dividends on, or repurchasing, its common stock without the approval of the lenders. None of the covenants of the Credit Facility negatively affect the Company’s liquidity or capital resources. Upon the occurrence of certain financial or economic events, significant corporate events, or certain other events of default constituting an event of default under the Credit Facility, all loans outstanding may be declared immediately due and payable and all commitments under the agreement may be terminated. The Company had no borrowings under the Credit Facility at March 31, 2017. The Company was in compliance with all covenants of the Credit Facility during the three months ended March 31, 2017.

Shareholders' Equity

3 Months Ended

Mar. 31, 2017

Stockholders' Equity Note [Abstract]

Shareholders' Equity

Shareholders’ Equity

Stock-Based Compensation

The Company has only non-qualified stock options outstanding under its equity compensation plans. All outstanding stock options have performance-based vesting provisions specific to each option grant that tie the vesting of the applicable stock options to the Company’s financial performance. The Company’s stock options vest at a rate of 50 percent when a specified diluted earnings per share target is achieved, and the remaining 50 percent when a second, higher specified diluted earnings per share target is achieved. Options do not vest due to the passage of time but solely as a result of achievement of the financial vesting targets. The amount of stock-based compensation expense is based upon management’s estimate of when the earnings per share targets may be achieved.

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended March 31, 2017 and 2016, respectively, as follows:



	Three Months Ended March 31,
	2017			2016
Stock-based compensation expense	$	6,180		$	3,789
Less: Deferred tax benefit	(2,153		)	(1,299		)
Stock-based compensation expense, net of tax	$	4,027		$	2,490

As of March 31, 2017, there was approximately $70,634 of unrecognized compensation cost remaining related to unvested employee stock options that management expects will vest and is being amortized.

The Company issues new common shares associated with the exercise of stock options. The total intrinsic value of options exercised during the three months ended March 31, 2017 was $21,407. The total options exercisable as of March 31, 2017 had an intrinsic value of $174,085. The total intrinsic value for options exercisable is calculated as the difference between the market value of the Company’s common stock as of March 31, 2017 and the weighted average exercise price of the shares. The market value of the Company’s common stock as of March 31, 2017 was $50.44 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of March 31, 2017 was $21.22. Total options that were outstanding and exercisable as of March 31, 2017 were 17,237,000 and 5,958,000, respectively.

Common Stock Buyback

The Company’s Board of Directors, under multiple authorizations, has authorized the repurchase of the Company’s common stock on the open market or through private transactions. The Company purchased 1,099,000 shares at a total cost of $55,441 during the three months ended March 31, 2017, which reduced the total shares outstanding of common stock. The cost of stock purchases during the period includes the cost of certain transactions that settled in the following quarter. As of March 31, 2017, the Company had approximately $163,311 of authorization remaining for the purchase of common stock under the program.

The Company immediately retires its common stock when purchased. Upon retirement, the Company reduces Capital in excess of par value for the average capital per share outstanding and the remainder is charged against Retained earnings. If the Company reduces its Retained earnings to zero, any subsequent purchases of common stock will be charged entirely to Capital in excess of par value.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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+ Details

Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2017

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Comprehensive Income (Loss)

Accumulated Other Comprehensive Loss

The components of Accumulated other comprehensive loss, net of tax, are as follows:



	Foreign Currency Translation Adjustments			Unrealized Gains (Losses) on Investments			Accumulated Other Comprehensive Loss
Balance, January 1, 2017	$	(37,119	)	$	(836	)	$	(37,955	)

Other comprehensive gain before reclassifications	2,488			(24		)	2,464
Amounts reclassified from accumulated other comprehensive loss	—			(22		)	(22		)
Net current-period other comprehensive gain	2,488			(46		)	2,442

Balance, March 31, 2017	$	(34,631	)	$	(882	)	$	(35,513	)

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

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+ Details

Business Segment Information

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Business Segment Information

The Company’s reportable business segments are:

Private Banks – provides investment processing and investment management programs to banks and trust institutions, independent wealth advisers and financial advisors worldwide;

Investment Advisors – provides investment management programs to affluent investors through a network of independent registered investment advisors, financial planners and other investment professionals in the United States;

Institutional Investors – provides investment management programs and administrative outsourcing solutions to retirement plan sponsors, hospitals and not-for-profit organizations worldwide;

Investment Managers – provides investment operations outsourcing solutions to fund companies, banking institutions and both traditional and non-traditional investment managers worldwide; and

Investments in New Businesses – focuses on providing investment management programs to ultra-high-net-worth families residing in the United States; developing internet-based investment services and advice solutions; entering new markets; and conducting other research and development activities.

The information in the following tables is derived from the Company’s internal financial reporting used for corporate management purposes. There are no inter-segment revenues for the three months ended March 31, 2017 and 2016. Management evaluates Company assets on a consolidated basis during interim periods. The accounting policies of the reportable business segments are the same as those described in Note 1 to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.

The following tables highlight certain financial information about each of the Company’s business segments for the three months ended March 31, 2017 and 2016.



	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses			Total
	For the Three Months Ended March 31, 2017
Revenues	$	112,634	$	88,238	$	77,004	$	80,487	$	1,621		$	359,984
Expenses	108,550		47,539		38,828		52,065		4,880			251,862
Operating profit (loss)	$	4,084	$	40,699	$	38,176	$	28,422	$	(3,259	)	$	108,122



	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses			Total
	For the Three Months Ended March 31, 2016
Revenues	$	113,361	$	76,679	$	72,897	$	69,918	$	1,408		$	334,263
Expenses	103,741		44,774		35,382		45,275		5,232			234,404
Operating profit (loss)	$	9,620	$	31,905	$	37,515	$	24,643	$	(3,824	)	$	99,859
Gain on sale of subsidiary	2,791		—		—		—		—			2,791
Segment profit (loss)	$	12,411	$	31,905	$	37,515	$	24,643	$	(3,824	)	$	102,650

A reconciliation of the total operating profit reported for the business segments to income from operations in the Consolidated Statements of Operations for the three months ended March 31, 2017 and 2016 is as follows:



	2017			2016
Total operating profit from segments	$	108,122		$	99,859
Corporate overhead expenses	(14,605		)	(13,047		)
Income from operations	$	93,517		$	86,812

The following tables provide additional information for the three months ended March 31, 2017 and 2016 pertaining to our business segments:



	Capital Expenditures (1)				Depreciation
	2017		2016		2017		2016
Private Banks	$	12,850	$	8,712	$	4,410	$	3,181
Investment Advisors	4,532		2,852		733		976
Institutional Investors	811		796		227		334
Investment Managers	1,615		1,322		916		1,190
Investments in New Businesses	106		94		368		548
Total from business segments	$	19,914	$	13,776	$	6,654	$	6,229
Corporate overhead	152		310		146		218
	$	20,066	$	14,086	$	6,800	$	6,447

(1) Capital expenditures include additions to property and equipment and capitalized software.



	Amortization
	2017		2016
Private Banks	$	8,464	$	7,711
Investment Advisors	2,850		2,553
Institutional Investors	323		399
Investment Managers	216		266
Investments in New Businesses	119		26
Total from business segments	$	11,972	$	10,955
Corporate overhead	50		57
	$	12,022	$	11,012

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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+ Details

Income Taxes

3 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

The gross liability for unrecognized tax benefits at March 31, 2017 and December 31, 2016 was $18,077 and $17,287, respectively, exclusive of interest and penalties, of which $15,633 and $14,868 would affect the effective tax rate if the Company were to recognize the tax benefit.

The Company classifies interest and penalties on unrecognized tax benefits as income tax expense. As of March 31, 2017 and December 31, 2016, the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $1,382 and $1,224, respectively.



	March 31, 2017		December 31, 2016
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$	18,077	$	17,287
Interest and penalties on unrecognized benefits	1,382		1,224
Total gross uncertain tax positions	$	19,459	$	18,511
Amount included in Current liabilities	$	3,849	$	3,866
Amount included in Other long-term liabilities	15,610		14,645
	$	19,459	$	18,511

The Company's effective income tax rate for the three months ended March 31, 2017 and 2016 differs from the federal income tax statutory rate due to the following:



	2017		2016
Statutory rate	35.0	%	35.0	%
State taxes, net of federal tax benefit	1.5		1.4
Foreign tax expense and tax rate differential	(0.8	)	(0.7	)
Tax benefit from stock option exercises	(4.2	)	—
Other, net	(0.5	)	(0.5	)
	31.0	%	35.2	%

The decrease in the tax rate for the three months ended March 31, 2017 was primarily due to the adoption of ASU 2016-09. Under this standard, the tax effects of stock option exercises are treated as discrete items in the reporting period in which they occur. Therefore, the tax effect of stock option exercises is not spread over the entire year through the use of the annual effective tax rate, but instead is recorded entirely in the period in which the tax deduction arose. Accordingly, the Company recorded the income tax benefit as a discrete item in income for the three months ended March 31, 2017. The Company's effective tax rate could fluctuate significantly on a quarterly basis due to the tax effects of stock-based compensation.

The Company files income tax returns in the United States on a consolidated basis and in many U.S. state and foreign jurisdictions. The Company is subject to examination of income tax returns by the Internal Revenue Service (IRS) and other domestic and foreign tax authorities. The Company is no longer subject to U.S. federal income tax examination for years before 2013 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2010.

The Company estimates it will recognize $3,849 of gross unrecognized tax benefits which is expected to be paid within one year due to the expiration of the statute of limitations and resolution of income tax audits and is netted against the current payable account. These unrecognized tax benefits are related to tax positions taken on certain federal, state, and foreign tax returns. However, the timing of the resolution of income tax examinations is highly uncertain, and the amounts ultimately paid, if any, upon resolution of the issues raised by the taxing authorities may differ materially from the amounts accrued for each year. While it is reasonably possible that some issues under examination could be resolved in the next twelve months, based upon the current facts and circumstances, the Company cannot reasonably estimate the timing of such resolution or the total range of potential changes as it relates to the current unrecognized tax benefits that are recorded as part of the Company’s financial statements.

Commitments And Contingencies	3 Months Ended
Commitments And Contingencies	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	Commitments and Contingencies In the normal course of business, the Company is party to various claims and legal proceedings. SEI has been named in seven lawsuits filed in Louisiana courts; four of the cases also name SPTC as a defendant. The underlying allegations in all actions relate to the purported role of SPTC in providing back-office services to Stanford Trust Company. The complaints allege that SEI and SPTC participated in some manner in the sale of “certificates of deposit” issued by Stanford International Bank so as to be a “seller” of the certificates of deposit for purposes of primary liability under the Louisiana Securities Law or so as to be secondarily liable under that statute for sales of certificates of deposit made by Stanford Trust Company. Two of the actions also include claims for violations of the Louisiana Racketeering Act and possibly conspiracy, and a third also asserts claims of negligence, breach of contract, breach of fiduciary duty, violations of the uniform fiduciaries law, negligent misrepresentation, detrimental reliance, violations of the Louisiana Racketeering Act, and conspiracy. The procedural status of the seven cases varies. The Lillie case, filed originally in the 19th Judicial District Court for the Parish of East Baton Rouge, was brought as a class action and is procedurally the most advanced of the cases. SEI and SPTC filed exceptions, which the Court granted in part, dismissing claims under the Louisiana Unfair Trade Practices Act and permitting the claims under the Louisiana Securities Law to go forward. On March 11, 2013, newly-added insurance carrier defendants removed the case to the United States District Court for the Middle District of Louisiana. On August 7, 2013, the Judicial Panel on Multidistrict Litigation transferred the matter to the Northern District of Texas where MDL 2099, In re: Stanford Entities Securities Litigation (“the Stanford MDL”), is pending. On September 22, 2015, the District Court on the motion of SEI and SPTC dismissed plaintiffs’ claims for primary liability under Section 714(A) of the Louisiana Securities Law, but declined to dismiss plaintiffs’ claims for secondary liability under Section 714(B) of the Louisiana Securities Law based on the allegations pled by plaintiffs. On November 4, 2015, the District Court granted SEI and SPTC's motion to dismiss plaintiffs' claims under Section 712(D) of the Louisiana Securities Law. Consequently, the only claims of plaintiffs still pending before the District Court in Lillie are plaintiffs' claims for secondary liability against SEI and SPTC under Section 714(B) of the Louisiana Securities Law. On May 2, 2016, the District Court certified the class as being "all persons for whom Stanford Trust Company purchased or renewed Stanford Investment Bank Limited certificates of deposit in Louisiana between January 1, 2007 and February 13, 2009". Notice of the pendency of the class action was mailed to potential class members on October 4, 2016. On December 1, 2016, a group of plaintiffs who opted out of the Lillie class filed a complaint against SEI and SPTC in the United States District Court in the Middle District of Louisiana, alleging claims essentially the same as those in Lillie. In January 2017, the Judicial Panel on Multidistrict Litigation transferred the proceeding to the Northern District of Texas and the Stanford MDL. During February 2017, SEI filed its response to the Complaint and in March 2017 the District Court for the Northern District of Texas approved the stipulated dismissal of all claims in this complaint predicated on Section 712(D) or Section 714(A) of the Louisiana Securities Law. Another one of the cases, filed in the 23rd Judicial District Court for the Parish of Ascension, also was removed to federal court and transferred by the Judicial Panel on Multidistrict Litigation to the Northern District of Texas and the Stanford MDL. The schedule for responding to that Complaint has not yet been established. The plaintiffs in two of the cases remaining in the Parish of East Baton Rouge have granted SEI and SPTC indefinite extensions to respond to the petitions. In the two additional cases, filed in East Baton Rouge and brought by the same counsel who filed the Lillie action, virtually all of the litigation to date has involved motions practice and appellate litigation regarding the existence of federal subjection matter jurisdiction under the federal Securities Litigation Uniform Standards Act (SLUSA). After the matter was removed to the United States District Court for the Northern District of Texas, that court dismissed the action under SLUSA. The Court of Appeals for the Fifth Circuit reversed that order, and the Supreme Court of the United States affirmed the Court of Appeals judgment on February 26, 2014. The matter was remanded to state court and no material activity has taken place since that date. While the outcome of this litigation remains uncertain, SEI and SPTC believe that they have valid defenses to plaintiffs' claims and intend to defend the lawsuits vigorously. Because of uncertainty in the make-up of the Lillie class, the specific theories of liability that may survive a motion for summary judgment or other dispositive motion, the relative lack of discovery regarding damages, causation, mitigation and other aspects that may ultimately bear upon loss, the Company is not reasonably able to provide an estimate of loss, if any, with respect to the foregoing lawsuits. On November 26, 2014, a Writ of Summons was issued to two of our subsidiaries, SEI Investments - Global Fund Services Limited (GFSL) and SEI Investments - Depositary & Custodial Services (Ireland) Limited (D&C), to appear before the Court of First Instance Antwerp, Belgium. The plaintiffs in this case allege that through their initial investments in collective investment funds domiciled in Netherlands and subsequent transfer of claim rights to a Belgium domiciled partnership, they are beneficial owners of a portfolio of life settlement policies (the Portfolio) which lapsed due to a failure to make premium payments. The plaintiffs seek to recover jointly and severally from nine defendants including GFSL and D&C, damages of approximately $84 million. GFSL and D&C’s involvement in the litigation appears to arise out of their historical provision of administration and custody services, respectively, to the Strategic Life Settlement Fund PLC, who, together with its managers, appear to be the principal defendants in this claim. On December 4, 2015, the Belgium Court dismissed plaintiff's claims for a lack of jurisdiction. On December 22, 2015, the plaintiffs appealed the dismissal. The appeal is still pending. While the outcome of this action is uncertain given its early phase and the lack of specific theories of liability asserted against GFSL and D&C, each of GFSL and D&C believe that they have valid defenses to plaintiffs’ claims and intend to defend the lawsuit vigorously, and GFSL and D&C are not reasonably able to provide an estimate of the ultimate loss, if any, with respect to this lawsuit.

Sale of SEI Asset Korea	3 Months Ended
Sale of SEI Asset Korea	Mar. 31, 2017
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]
Sale of SEI Asset Korea	Sale of SEI Asset Korea On July 31, 2012, the Company, MetLife International Holdings, Inc. (MetLife) and International Finance Corporation (IFC) entered into a definitive agreement with Baring Asset Management Limited (Barings) to sell all ownership interest in SEI Asset Korea (SEI AK). SEI AK was located in South Korea and provided domestic equity and fixed-income investment management services to financial institutions and pension funds. On March 28, 2013, all conditions subject to closing the transaction were satisfied and all ownership interests in SEI AK were transferred to Barings. Under the terms of the agreement, a portion of the purchase price was paid upon closing with up to an additional $11,220 payable to the Company as a contingent purchase price with respect to three one-year periods ending on December 31, 2013, 2014, and 2015 depending upon whether SEI AK achieves specified revenue measures during such periods. The Company recognized a pre-tax gain of $2,791, or $0.01 diluted earnings per share, during the three months ended March 31, 2016 representing the final annual payment under the terms of the agreement. The Company's gain from the sale of SEI AK are included in Gain on sale of subsidiary on the accompanying Consolidated Statement of Operations.

- Definition

The entire disclosure related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721665-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Paragraph 5C
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=64862545&loc=SL51724579-110230

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
-Paragraph 4A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721663-107760

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2941-110230

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 5B
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Section 50
-Paragraph 3A
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-Paragraph 5A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721671-107760

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5D
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721677-107760

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1474-107760

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760

+ Details

Summary of Significant Accounting Policies (Policy)	3 Months Ended
Summary of Significant Accounting Policies (Policy)	Mar. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America. Certain financial information and accompanying note disclosure normally included in the Company’s Annual Report on Form 10-K have been condensed or omitted. The interim financial information is unaudited but reflects all adjustments (consisting of only normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of financial position of the Company as of March 31, 2017, the results of operations for the three months ended March 31, 2017 and 2016, and cash flows for the three-month periods ended March 31, 2017 and 2016. These interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and the Notes to the Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. There have been no significant changes in significant accounting policies during the three months ended March 31, 2017 as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 with the exception of the adoption of Accounting Standards Update (ASU) 2016-09, Improvements to Employee Share-Based Payment Accounting (ASU 2016-09). As required by ASU 2016-09, excess tax benefits recognized on stock-based compensation expense are reflected in the accompanying Consolidated Statements of Operations as a component of the provision for income taxes on a prospective basis (See Note 11). Additionally, excess tax benefits or deficiencies recognized on stock-based compensation expense are classified as an operating activity in the accompanying Consolidated Statements of Cash Flows. The Company has applied this provision retrospectively for the periods prior to the date of adoption. As a result, for the three months ended March 31, 2016, net cash provided by operating activities increased by $624 with a corresponding offset to net cash used for financing activities. ASU 2016-09 also allows for the option to account for forfeitures as they occur when determining the amount of compensation cost to be recognized, rather than estimating expected forfeitures over the course of a vesting period. The Company elected to account for forfeitures as they occur. In addition, ASU 2016-09 eliminates anticipated windfalls and shortfalls that were included in the calculation of assumed proceeds for computing the dilutive effect of share-based payment awards in the calculation of diluted earnings per share. No adjustments to the Company's prior period reported diluted earnings per share amounts were permitted by ASU 2016-09. The net cumulative effect to the Company from the adoption of ASU 2016-09 was an increase to paid-in capital of $2,582, a reduction to retained earnings of $1,669 and an increase to deferred tax assets of $913 as of January 1, 2017.
Reclassifications	Reclassifications Certain prior year amounts have been reclassified to conform to current year presentation.
Cash and Cash Equivalents	Statements of Cash Flows For purposes of the Consolidated Statements of Cash Flows, the Company considers investment instruments purchased with an original maturity of three months or less to be cash equivalents.
New Accounting Pronouncements	New Accounting Pronouncements On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (ASU 2014-09), requiring an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The updated standard permits the use of either the retrospective or cumulative effect transition method. The FASB has recently issued several amendments to the standard, including principal versus agent guidance and identifying performance obligations. ASU 2014-09 currently becomes effective for the Company during the first quarter 2018. The Company continues to assess the impact ASU 2014-09 will have on its revenue arrangements with completion, including selecting a transition method, expected by the third quarter of 2017. The majority of the Company’s services are bundled together and provided and completed for the client on a monthly basis. The Company expects revenue for these services to continue to be recognized monthly because of the continuous transfer of control to the client. Therefore, the adoption of this ASU is not expected to have a material impact on the recognition of revenue for the majority of the fees recognized for the services provided. However, the Company believes the adoption of the new standard may affect the timing of the recognition of implementation fees recognized in Information processing and software servicing fees as well as fund conversion fees and other ancillary fees recognized in Asset management, administration and distribution fees. Transaction-based and trade execution fees are based on current period activity and is not expected to be affected by the adoption of ASU 2014-09. Due to the complexity of some of our agreements, the actual revenue recognition treatment required under the standard will be dependent on contract-specific terms, and certain aspects may vary in some instances from recognition ratably over the contract term. The new standard also modified some of the principal and agent considerations which may result in changes to gross or net treatment of revenue and expenses but would not affect final net income. The Company is also evaluating its sales commission programs affected by the standard. Previously, sales commission costs were expensed at inception of a sales agreement but under the new standard will generally need to be capitalized and amortized over the period of contract performance. The new standard provides companies with alternative methods of adoption and the Company is in the process of determining the method of adoption, which depends in part upon completion of the evaluation of the remaining revenue arrangements. In February 2016, the FASB issued ASU No. 2016-02, Leases (ASU 2016-02) requiring lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. For lessees, leases will continue to be classified as either operating or finance leases in the income statement. Lessor accounting is similar to the current model but updated to align with certain changes to the lessee model. Lessors will continue to classify leases as operating, direct financing or sales-type leases. The new standard must be adopted using a modified retrospective transition and requires application of the new guidance at the beginning of the earliest comparative period presented. The updated standard is effective for the Company beginning in the first quarter of 2019. Early adoption is permitted. The Company is currently evaluating the transition method that will be elected and the effect that the updated standard will have on its consolidated financial statements and related disclosures.
Equity Method Investments	The Company accounts for its interest in LSV using the equity method because of its less than 50 percent ownership. The Company’s interest in the net assets of LSV is reflected in Investment in unconsolidated affiliate on the accompanying Consolidated Balance Sheets and its interest in the earnings of LSV is reflected in Equity in earnings of unconsolidated affiliate on the accompanying Consolidated Statements of Operations.
Variable Interest Entities	The Company has concluded that it is not the primary beneficiary of the entities and; therefore, is not required to consolidate any of the pooled investment vehicles for which it receives asset management, distribution, administration and custodial fees under the VIE model. The entities either do not meet the definition of a VIE or the Company does not hold a variable interest in the entities. The entities either qualify for the money market scope exception, or are entities in which the Company’s asset management, distribution, administration and custodial fees are commensurate with the services provided and include fair terms and conditions, or are entities that are limited partnerships which have substantive kick-out rights. The Company acts as a fiduciary and does not hold any other interests other than insignificant seed money investments in the pooled investment vehicles. For this reason, the Company also concluded that it is not required to consolidate the pooled investment vehicles under the VOE model.
Fair Value of Financial Instruments	The fair value of the Company’s financial assets and liabilities, except for the Company's investment funds sponsored by LSV, is determined in accordance with the fair value hierarchy. The fair value of the Company’s Level 1 financial assets consist mainly of investments in open-ended mutual funds that are quoted daily. Level 2 financial assets consist of Government National Mortgage Association (GNMA) mortgage-backed securities held by the Company's wholly-owned limited purpose federal thrift subsidiary, SEI Private Trust Company (SPTC), Federal Home Loan Bank (FHLB) and other U.S. government agency short-term notes held by SIDCO. The financial assets held by SIDCO were purchased as part of a cash management program requiring only short term, top-tier investment grade government and corporate securities. The financial assets held by SPTC are debt securities issued by GNMA and are backed by the full faith and credit of the U.S. government. These securities were purchased for the sole purpose of satisfying applicable regulatory requirements and have maturity dates which range from 2020 to 2041. The fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets. The valuation of the Company's Level 2 financial assets held by SIDCO and SPTC are based upon securities pricing policies and procedures utilized by third-party pricing vendors. The pricing policies and procedures applied during the three months ended March 31, 2017 were consistent with those as described in our Annual Report on Form 10-K at December 31, 2016.
Investments in Affiliated Funds	The fair value of the Company's investment funds sponsored by LSV is measured using the net asset value per share (NAV) as a practical expedient. The NAVs of the funds are calculated by the funds' independent custodian and are derived from the fair values of the underlying investments as of the reporting date. The funds allow for investor redemptions at the end of each calendar month. This investment has not been classified in the fair value hierarchy but is presented in the tables below to permit reconciliation to the amounts presented on the accompanying Consolidated Balance Sheets.
Available-for-sale Securities	These net unrealized losses are reported as a separate component of Accumulated other comprehensive loss on the accompanying Consolidated Balance Sheets.
Securities Owned	The Company’s broker-dealer subsidiary, SIDCO, has investments in U.S. government agency securities with maturity dates less than one year. These investments are reflected as Securities owned on the accompanying Consolidated Balance Sheets. Due to specialized accounting practices applicable to investments by broker-dealers, the securities are reported at fair value and changes in fair value are recorded in current period earnings.

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2017

Accounting Policies [Abstract]

Calculation Of Basic And Diluted Earnings Per Share

The calculations of basic and diluted earnings per share for the three months ended March 31, 2017 and 2016 are:



	Three Months Ended March 31,
	2017		2016
Net income	$	88,737	$	77,497
Shares used to compute basic earnings per common share	159,091,000		163,013,000
Dilutive effect of stock options	3,651,000		3,132,000
Shares used to compute diluted earnings per common share	162,742,000		166,145,000
Basic earnings per common share	$	0.56	$	0.48
Diluted earnings per common share	$	0.55	$	0.47

Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities

The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the three months ended March 31:



	2017			2016
Net income	$	88,737		$	77,497
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,800			6,447
Amortization	12,022			11,012
Equity in earnings of unconsolidated affiliate	(33,565		)	(29,192		)
Distributions received from unconsolidated affiliate	35,265			34,525
Stock-based compensation	6,180			3,789
Provision for losses on receivables	(5		)	51
Deferred income tax expense	877			(1,029		)
Gain from sale of SEI AK	—			(2,791		)
Net (gain) loss from investments	(347		)	126
Tax benefit on stock options exercised (1)	—			624
Change in other long-term liabilities	965			279
Change in other assets	(849		)	1,099
Other	56			676
Change in current asset and liabilities
Decrease (increase) in
Receivables from investment products	10,308			(3,535		)
Receivables	(24,243		)	(6,585		)
Other current assets	(2,298		)	(2,622		)
Increase (decrease) in
Accounts payable	1,406			(157		)
Accrued liabilities	(27,754		)	(12,120		)
Deferred revenue	(543		)	551
Total adjustments	(15,725		)	1,148
Net cash provided by operating activities	$	73,012		$	78,645

(1) The tax benefit on stock options exercised for the three months ended March 31, 2016 was reclassified to operating activities from financing activities upon the adoption of ASU 2016-09.

Investment In Unconsolidated Affiliate (Tables)

3 Months Ended

Mar. 31, 2017

Equity Method Investments and Joint Ventures [Abstract]

Condensed financial information of LSV

These tables contain condensed financial information of LSV:



Condensed Statement of Operations	Three Months Ended March 31,
	2017		2016
Revenues	$	109,953	$	92,653
Net income	86,215		74,457



Condensed Balance Sheets	March 31, 2017		December 31, 2016
Current assets	$	121,189	$	125,872
Non-current assets	1,782		1,927
Total assets	$	122,971	$	127,799

Current liabilities	$	40,506	$	39,303
Partners’ capital	82,465		88,496
Total liabilities and partners’ capital	$	122,971	$	127,799

Composition of Certain Financial Statement Captions (Tables)

3 Months Ended

Mar. 31, 2017

Items Included in Consolidated Statement of Financial Condition [Abstract]

Receivables

Receivables on the accompanying Consolidated Balance Sheets consist of:



	March 31, 2017			December 31, 2016
Trade receivables	$	54,973		$	48,683
Fees earned, not billed	186,894			168,971
Other receivables	10,856			10,826
	252,723			228,480
Less: Allowance for doubtful accounts	(518		)	(523		)
	$	252,205		$	227,957

Property And Equipment

Property and Equipment on the accompanying Consolidated Balance Sheets consists of:



	March 31, 2017			December 31, 2016
Buildings	$	152,171		$	152,171
Equipment	108,010			106,759
Land	10,030			10,030
Purchased software	128,377			128,008
Furniture and fixtures	17,407			17,292
Leasehold improvements	15,433			15,175
Construction in progress	2,798			2,077
	434,226			431,512
Less: Accumulated depreciation	(291,500		)	(285,322		)
Property and Equipment, net	$	142,726		$	146,190

Accrued Liabilities

Accrued liabilities on the accompanying Consolidated Balance Sheets consist of:



	March 31, 2017		December 31, 2016
Accrued employee compensation	$	25,949	$	79,735
Accrued consulting, outsourcing and professional fees	29,199		24,428
Accrued sub-advisory, distribution and other asset management fees	34,936		41,666
Accrued dividend payable	—		44,596
Accrued income taxes	36,524		3,721
Other accrued liabilities	40,453		46,379
Total accrued liabilities	$	167,061	$	240,525

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Of Certain Financial Assets And Liabilities

The fair value of certain financial assets and liabilities of the Company was determined using the following inputs:



			Fair Value Measurements at the End of the Reporting Period Using
Assets	March 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Equity available-for-sale securities	$	9,900	$	9,900	$	—
Fixed-income available-for-sale securities	79,362		—		79,362
Fixed-income securities owned	21,372		—		21,372
Investment funds sponsored by LSV (1)	5,156
	$	115,790	$	9,900	$	100,734



			Fair Value Measurements at the End of the Reporting Period Using
Assets	December 31, 2016		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Equity available-for-sale securities	$	9,581	$	9,581	$	—
Fixed-income available-for-sale securities	74,452		—		74,452
Fixed-income securities owned	21,339		—		21,339
Investment funds sponsored by LSV (1)	4,858
	$	110,230	$	9,581	$	95,791

Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2017

Marketable Securities [Abstract]

Investments Available For Sale

Investments available for sale classified as non-current assets consist of:



	At March 31, 2017
	Cost Amount		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	7,325	$	61	$	(817	)	$	6,569
Equities and other mutual funds	3,224		107		—			3,331
Debt securities	79,923		—		(561		)	79,362
	$	90,472	$	168	$	(1,378	)	$	89,262



	At December 31, 2016
	Cost Amount		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
SEI-sponsored mutual funds	$	7,357	$	24	$	(996	)	$	6,385
Equities and other mutual funds	2,968		228		—			3,196
Debt securities	74,843		—		(391		)	74,452
	$	85,168	$	252	$	(1,387	)	$	84,033

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2017

Stockholders' Equity Note [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended March 31, 2017 and 2016, respectively, as follows:



	Three Months Ended March 31,
	2017			2016
Stock-based compensation expense	$	6,180		$	3,789
Less: Deferred tax benefit	(2,153		)	(1,299		)
Stock-based compensation expense, net of tax	$	4,027		$	2,490

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2017

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule Of Accumulated Other Comprehensive Income (Loss), Net Of Tax

The components of Accumulated other comprehensive loss, net of tax, are as follows:



	Foreign Currency Translation Adjustments			Unrealized Gains (Losses) on Investments			Accumulated Other Comprehensive Loss
Balance, January 1, 2017	$	(37,119	)	$	(836	)	$	(37,955	)

Other comprehensive gain before reclassifications	2,488			(24		)	2,464
Amounts reclassified from accumulated other comprehensive loss	—			(22		)	(22		)
Net current-period other comprehensive gain	2,488			(46		)	2,442

Balance, March 31, 2017	$	(34,631	)	$	(882	)	$	(35,513	)

Business Segment Information (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting Information [Line Items]

Schedule Of Financial Information About Business Segments

The following tables highlight certain financial information about each of the Company’s business segments for the three months ended March 31, 2017 and 2016.



	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses			Total
	For the Three Months Ended March 31, 2017
Revenues	$	112,634	$	88,238	$	77,004	$	80,487	$	1,621		$	359,984
Expenses	108,550		47,539		38,828		52,065		4,880			251,862
Operating profit (loss)	$	4,084	$	40,699	$	38,176	$	28,422	$	(3,259	)	$	108,122



	Private Banks		Investment Advisors		Institutional Investors		Investment Managers		Investments In New Businesses			Total
	For the Three Months Ended March 31, 2016
Revenues	$	113,361	$	76,679	$	72,897	$	69,918	$	1,408		$	334,263
Expenses	103,741		44,774		35,382		45,275		5,232			234,404
Operating profit (loss)	$	9,620	$	31,905	$	37,515	$	24,643	$	(3,824	)	$	99,859
Gain on sale of subsidiary	2,791		—		—		—		—			2,791
Segment profit (loss)	$	12,411	$	31,905	$	37,515	$	24,643	$	(3,824	)	$	102,650

Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations



	2017			2016
Total operating profit from segments	$	108,122		$	99,859
Corporate overhead expenses	(14,605		)	(13,047		)
Income from operations	$	93,517		$	86,812

Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table Text Block]

The following tables provide additional information for the three months ended March 31, 2017 and 2016 pertaining to our business segments:



	Capital Expenditures (1)				Depreciation
	2017		2016		2017		2016
Private Banks	$	12,850	$	8,712	$	4,410	$	3,181
Investment Advisors	4,532		2,852		733		976
Institutional Investors	811		796		227		334
Investment Managers	1,615		1,322		916		1,190
Investments in New Businesses	106		94		368		548
Total from business segments	$	19,914	$	13,776	$	6,654	$	6,229
Corporate overhead	152		310		146		218
	$	20,066	$	14,086	$	6,800	$	6,447

(1) Capital expenditures include additions to property and equipment and capitalized software.



	Amortization
	2017		2016
Private Banks	$	8,464	$	7,711
Investment Advisors	2,850		2,553
Institutional Investors	323		399
Investment Managers	216		266
Investments in New Businesses	119		26
Total from business segments	$	11,972	$	10,955
Corporate overhead	50		57
	$	12,022	$	11,012

Income Taxes (Tables)

3 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

Schedule Of Interest And Penalties



	March 31, 2017		December 31, 2016
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$	18,077	$	17,287
Interest and penalties on unrecognized benefits	1,382		1,224
Total gross uncertain tax positions	$	19,459	$	18,511
Amount included in Current liabilities	$	3,849	$	3,866
Amount included in Other long-term liabilities	15,610		14,645
	$	19,459	$	18,511

Schedule of Effective Income Tax Rate Reconciliation

The Company's effective income tax rate for the three months ended March 31, 2017 and 2016 differs from the federal income tax statutory rate due to the following:



	2017		2016
Statutory rate	35.0	%	35.0	%
State taxes, net of federal tax benefit	1.5		1.4
Foreign tax expense and tax rate differential	(0.8	)	(0.7	)
Tax benefit from stock option exercises	(4.2	)	—
Other, net	(0.5	)	(0.5	)
	31.0	%	35.2	%

Summary of Significant Accounting Policies (New Accounting Pronouncements and Changes in Accounting Principle) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to net cash provided by operating activities	$ 73,012	$ 78,645
Corresponding offset to net cash used for financing activities	$ 84,303	114,573
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to net cash provided by operating activities		624
Corresponding offset to net cash used for financing activities		$ 624
Increase to deferred tax assets			$ 913
Accounting Standards Update 2016-09 [Member] \| Paid-in Capital [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cumulative effect adjustment			2,582
Accounting Standards Update 2016-09 [Member] \| Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cumulative effect adjustment			$ 1,669

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Cash and cash equivalents invested in SEI-sponsored money market funds	$ 661,372	$ 638,253	$ 695,701	$ 679,661
Restricted cash	3,500		3,500
Capitalized software development costs	16,861	$ 9,477
Net book value of SEI Wealth Platform	$ 300,756		295,867
Anti-dilutive employee stock options	11,279	10,506
Antidilutive securities excluded from computation of net income, per outstanding unit, amount	$ 37.70	$ 34.05
SEI Investments Distribution Co. (SIDCO) [Member]
Restricted cash	$ 500		500
SEI Investments (Europe) Limited [Member]
Restricted cash	3,000		3,000
SEI-Sponsored Open-Ended Money Market Mutual Funds [Member]
Cash and cash equivalents invested in SEI-sponsored money market funds	313,762		$ 374,760
SEI Wealth Platform [Member]
Capitalized software development costs	15,178	$ 7,645
Net book value of SEI Wealth Platform	$ 283,565
Estimated useful life of the SEI Wealth Platform	15 years
Amortization expense related to the SEI Wealth Platform	$ 11,972	10,955
New application for Investment Managers segment [Member]
Capitalized software development costs	$ 1,683	$ 1,832
Weighted Average [Member] \| SEI Wealth Platform [Member]
Estimated useful life of the SEI Wealth Platform	5 years 2 months 27 days

Summary of Significant Accounting Policies (Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accounting Policies [Abstract]
Net income	$ 88,737	$ 77,497
Shares used to compute basic earnings per common share	159,091	163,013
Dilutive effect of stock options	3,651	3,132
Shares used to compute diluted earnings per common share	162,742	166,145
Basic earnings per common share	$ 0.56	$ 0.48
Diluted earnings per common share	$ 0.55	$ 0.47

Summary of Significant Accounting Policies (Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accounting Policies [Abstract]
Net income	$ 88,737	$ 77,497
Depreciation	6,800	6,447
Amortization	12,022	11,012
Equity in earnings of unconsolidated affiliate	(33,565)	(29,192)
Distributions received from unconsolidated affiliate	35,265	34,525
Stock-based compensation	6,180	3,789
Provision for losses on receivables	(5)	51
Deferred income tax expense	877	(1,029)
Gain from sale of SEI AK	0	(2,791)
Net (gain) loss from investments	(347)	126
Tax benefit on stock options exercised (1)	0	624
Change in other long-term liabilities	965	279
Change in other assets	(849)	1,099
Other	56	676
Decrease (increase) in Receivables from investment products	10,308	(3,535)
Decrease (increase) in Receivables	(24,243)	(6,585)
Decrease (increase) in Other current assets	(2,298)	(2,622)
Increase (decrease) in Accounts payable	1,406	(157)
Increase (decrease) in Accrued liabilities	(27,754)	(12,120)
Increase (decrease) in Deferred revenue	(543)	551
Total adjustments	(15,725)	1,148
Net cash provided by operating activities	$ 73,012	$ 78,645

Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Apr. 13, 2017	Apr. 30, 2016	Oct. 31, 2012
Investments in and Advances to Affiliates [Line Items]
Distributions received from unconsolidated affiliate	$ 35,265	$ 34,525
Company's share in the earnings of equity method investee	33,565	$ 29,192
LSV Employee Group III [Member]
Investments in and Advances to Affiliates [Line Items]
Purchase of partnership interest value					$ 77,700
Amount of purchase price financed through term loans					69,930
Financial Guarantee [Member] \| L S V Asset Management [Member]
Investments in and Advances to Affiliates [Line Items]
Amount of guarantor's obligation, maximum exposure					24,930
Financial Guarantee [Member] \| LSV Employee Group III [Member]
Investments in and Advances to Affiliates [Line Items]
Amount of guarantor's obligation, maximum exposure					$ 45,000
Financial Guarantee [Member] \| LSV Employee Group III [Member] \| Subsequent Event [Member]
Investments in and Advances to Affiliates [Line Items]
Amount of guarantor's obligation, maximum exposure			$ 1,065
Amount of guarantor's obligation, current carrying value			$ 0
L S V Asset Management [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage		39.20%		38.90%
Total investment in equity method investee	48,759
Distributions received from unconsolidated affiliate	35,265	$ 34,525
Company's share in the earnings of equity method investee	$ 33,565	$ 29,192
Maximum [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage	50.00%

Investment In Unconsolidated Affiliate (Condensed Statement Of Operations Of LSV) (Details) - L S V Asset Management [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]
Revenue of LSV Asset Management	$ 109,953	$ 92,653
Net income of LSV Asset Management	$ 86,215	$ 74,457

Investment in Unconsolidated Affiliate (Condensed Balance Sheets Of LSV) (Details) - L S V Asset Management [Member] - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Current assets	$ 121,189	$ 125,872
Non-current assets	1,782	1,927
Total assets	122,971	127,799
Current liabilities	40,506	39,303
Partners’ capital	82,465	88,496
Total liabilities and partners’ capital	$ 122,971	$ 127,799

Variable Interest Entities - Investment Products (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
SEI-Sponsored Open-Ended Money Market Mutual Funds [Member]
Financial Support for Nonconsolidated Legal Entity [Line Items]
Fees waived according to expense limitation agreements	$ 7,072	$ 12,477

Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Items Included in Consolidated Statement of Financial Condition [Abstract]
Trade receivables	$ 54,973	$ 48,683
Fees earned, not billed	186,894	168,971
Other receivables	10,856	10,826
Receivables, Gross, Current	252,723	228,480
Less: Allowance for doubtful accounts	(518)	(523)
Receivables, net	$ 252,205	$ 227,957

Composition of Certain Financial Statement Captions (Property And Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 434,226		$ 431,512
Less: Accumulated depreciation	(291,500)		(285,322)
Property and Equipment, net	142,726		146,190
Depreciation expense	6,800	$ 6,447
Building [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	152,171		152,171
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	108,010		106,759
Land [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	10,030		10,030
Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	128,377		128,008
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	17,407		17,292
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	15,433		15,175
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 2,798		$ 2,077

Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 25,949	$ 79,735
Accrued consulting, outsourcing and professional fees	29,199	24,428
Accrued sub-advisory, distribution and other asset management fees	34,936	41,666
Accrued dividend payable	0	44,596
Accrued income taxes	36,524	3,721
Other accrued liabilities	40,453	46,379
Total accrued liabilities	$ 167,061	$ 240,525

Fair Value Measurements (Fair Value Of Certain Financial Assets And Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	$ 9,900	$ 9,581
Fixed income available-for-sale securities	79,362	74,452
Fixed income securities owned	21,372	21,339
Investment funds sponsored by LSV	5,156	4,858
Assets, fair value	115,790	110,230
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	9,900	9,581
Fixed income available-for-sale securities	0	0
Fixed income securities owned	0	0
Assets, fair value	9,900	9,581
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	0	0
Fixed income available-for-sale securities	79,362	74,452
Fixed income securities owned	21,372	21,339
Assets, fair value	$ 100,734	$ 95,791

Marketable Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Schedule of Investments [Line Items]
Net unrealized losses	$ (882)		$ (836)
Unrealized losses during the period, income tax benefit	(328)		(299)
Available-for-sale securities, gross realized gains	261	$ 13
Available-for-sale securities, gross realized losses	229	303
Fair value of investment funds sponsored by LSV	5,156		4,858
Securities owned	21,372		21,339
Private Equity Funds, Foreign [Member]
Schedule of Investments [Line Items]
Fair value of investment funds sponsored by LSV	5,156		$ 4,858
Gains from investment funds sponsored by LSV	$ 298	$ 144

Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	$ 90,472	$ 85,168
Available-for-sale securities, accumulated gross unrealized gain, before tax	168	252
Available-for-sale securities, accumulated gross unrealized loss, before tax	(1,378)	(1,387)
Available-for-sale securities, fair value	89,262	84,033
SEI-Sponsored Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	7,325	7,357
Available-for-sale securities, accumulated gross unrealized gain, before tax	61	24
Available-for-sale securities, accumulated gross unrealized loss, before tax	(817)	(996)
Available-for-sale securities, fair value	6,569	6,385
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	3,224	2,968
Available-for-sale securities, accumulated gross unrealized gain, before tax	107	228
Available-for-sale securities, accumulated gross unrealized loss, before tax	0	0
Available-for-sale securities, fair value	3,331	3,196
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	79,923	74,843
Available-for-sale securities, accumulated gross unrealized gain, before tax	0	0
Available-for-sale securities, accumulated gross unrealized loss, before tax	(561)	(391)
Available-for-sale securities, fair value	$ 79,362	$ 74,452

Lines of Credit (Details) - USD ($)	Jun. 13, 2016	Mar. 31, 2017
Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread (as a percent)	1.00%
Line of Credit [Member]
Line of Credit Facility [Line Items]
Credit facility term	5 years
Credit facility expiration date	Jun. 12, 2021
Borrowings outstanding		$ 0
2016 Credit Facility [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	$ 300,000,000
Credit facility stated percentage	0.00%
Credit facility accordion feature, increase limit	$ 100,000,000
2016 Credit Facility [Member] \| Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility description of variable rate basis	London InterBank Offered Rate
2016 Credit Facility [Member] \| Revolving Credit Facility [Member] \| Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread (as a percent)	0.50%
Credit facility description of variable rate basis	Federal Funds Rate
2016 Credit Facility [Member] \| Minimum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion (as a percent)	0.15%
2016 Credit Facility [Member] \| Minimum [Member] \| Revolving Credit Facility [Member] \| Lender's Base Rate Plus Market Spread [Member]
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread (as a percent)	0.25%
2016 Credit Facility [Member] \| Minimum [Member] \| Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread (as a percent)	1.25%
2016 Credit Facility [Member] \| Maximum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion (as a percent)	0.30%
2016 Credit Facility [Member] \| Maximum [Member] \| Revolving Credit Facility [Member] \| Lender's Base Rate Plus Market Spread [Member]
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread (as a percent)	1.00%
2016 Credit Facility [Member] \| Maximum [Member] \| Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread (as a percent)	2.00%

Shareholders' Equity (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 70,634
Total intrinsic value of options exercised	21,407
Aggregate intrinsic value of options exercisable	$ 174,085
Market value of Company's common stock \| $ / shares	$ 50.44
Weighted average exercise price per share \| $ / shares	$ 21.22
Total options outstanding \| shares	17,237
Total options exercisable \| shares	5,958
Common Stock Buyback [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased and retired \| shares	1,099
Company purchased, cost	$ 55,441
Remaining stock repurchase authorization amount	$ 163,311
2014 Plan [Member] \| Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate	50.00%
2014 Plan [Member] \| Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate	50.00%

Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 6,180	$ 3,789
Less: Deferred tax benefit	(2,153)	(1,299)
Stock-based compensation expense, net of tax	$ 4,027	$ 2,490

Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (37,955)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	2,464
Amounts reclassified from accumulated other comprehensive loss	(22)
Net current-period other comprehensive gain	2,442
Ending balance	(35,513)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(37,119)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	2,488
Amounts reclassified from accumulated other comprehensive loss	0
Net current-period other comprehensive gain	2,488
Ending balance	(34,631)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(836)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive gain before reclassifications	(24)
Amounts reclassified from accumulated other comprehensive loss	(22)
Net current-period other comprehensive gain	(46)
Ending balance	$ (882)

Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 359,984	$ 334,263
Expenses	251,862	234,404
Operating profit (loss)	108,122	99,859
Gain on sale of subsidiary	0	2,791
Segment profit (loss)	108,122	102,650
Private Banks [Member]
Segment Reporting Information [Line Items]
Revenues	112,634	113,361
Expenses	108,550	103,741
Operating profit (loss)	4,084	9,620
Gain on sale of subsidiary	0	2,791
Segment profit (loss)	4,084	12,411
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Revenues	88,238	76,679
Expenses	47,539	44,774
Operating profit (loss)	40,699	31,905
Gain on sale of subsidiary	0	0
Segment profit (loss)	40,699	31,905
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Revenues	77,004	72,897
Expenses	38,828	35,382
Operating profit (loss)	38,176	37,515
Gain on sale of subsidiary	0	0
Segment profit (loss)	38,176	37,515
Investment Managers [Member]
Segment Reporting Information [Line Items]
Revenues	80,487	69,918
Expenses	52,065	45,275
Operating profit (loss)	28,422	24,643
Gain on sale of subsidiary	0	0
Segment profit (loss)	28,422	24,643
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Revenues	1,621	1,408
Expenses	4,880	5,232
Operating profit (loss)	(3,259)	(3,824)
Gain on sale of subsidiary	0	0
Segment profit (loss)	$ (3,259)	$ (3,824)

Business Segment Information (Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Total operating profit from segments above	$ 108,122	$ 99,859
Income from operations	93,517	86,812
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total operating profit from segments above	108,122	99,859
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Corporate overhead expenses	$ (14,605)	$ (13,047)

Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Capital Expenditures	$ 20,066	$ 14,086
Depreciation	6,800	6,447
Amortization	12,022	11,012
Private Banks [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	12,850	8,712
Depreciation	4,410	3,181
Amortization	8,464	7,711
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	4,532	2,852
Depreciation	733	976
Amortization	2,850	2,553
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	811	796
Depreciation	227	334
Amortization	323	399
Investment Managers [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	1,615	1,322
Depreciation	916	1,190
Amortization	216	266
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	106	94
Depreciation	368	548
Amortization	119	26
Total From Business Segments [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	19,914	13,776
Depreciation	6,654	6,229
Amortization	11,972	10,955
Corporate Overhead [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	152	310
Depreciation	146	218
Amortization	$ 50	$ 57

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 18,077	$ 17,287
Unrecognized tax benefits that would affect effective tax rate	15,633	14,868
Interest and penalties on unrecognized benefits	1,382	$ 1,224
Settlement and Lapse of Statute [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits within the next twelve months	$ 3,849

Income Taxes (Interest And Penalties) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 18,077	$ 17,287
Interest and penalties on unrecognized benefits	1,382	1,224
Gross uncertain tax positions	19,459	18,511
Amount included in Current liabilities	3,849	3,866
Amount included in Other long-term liabilities	$ 15,610	$ 14,645

Income Taxes Income Taxes (Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate) (Details)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Abstract]
Statutory rate	35.00%	35.00%
State taxes, net of federal tax benefit	1.50%	1.40%
Foreign tax expense and tax rate differential	(0.80%)	(0.70%)
Tax benefit from stock option exercises	(4.20%)	0.00%
Other, net	(0.50%)	(0.50%)
Effective income tax rate	31.00%	35.20%

Sale of SEI Asset Korea (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 28, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of subsidiary	$ 0	$ 2,791
SEI Asset Korea Co., Ltd. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contingent purchase price from sale of SEI AK			$ 11,220
Gain on sale of subsidiary		$ 2,791
Gain on sale of subsidiary, diluted earnings per share impact, net		$ 0.01

- Definition

The amount of net income (loss) for the period attributable to extraordinary items that is available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(14))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(19))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(16))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1311-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(23))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(18))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(21))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details