SEI Investments (SEIC) 10-Q 24 Apr 23 2023 Q1 Quarterly report Financial data

Cover page

Cover page - shares	3 Months Ended
	Mar. 31, 2023	Apr. 18, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	0-10200
Entity Registrant Name	SEI INVESTMENTS COMPANY
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	23-1707341
Entity Address, Address Line One	1 Freedom Valley Drive
Entity Address, City or Town	Oaks
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19456
City Area Code	610
Local Phone Number	676-1000
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	SEIC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		133,306,087
Entity Central Index Key	0000350894
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Amendment Flag	false
Current Fiscal Year End Date	--12-31

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 834,355	$ 853,008
Restricted cash	352	351
Receivables from investment products	55,744	62,014
Receivables, net of allowance for doubtful accounts of $721 and $901	458,226	457,084
Securities owned	31,779	32,148
Other current assets	50,964	48,703
Total Current Assets	1,431,420	1,453,308
Property and Equipment, net of accumulated depreciation of $449,628 and $440,861	183,207	181,029
Operating Lease Right-of-Use Assets	23,992	24,992
Capitalized Software, net of accumulated amortization of $593,049 and $586,744	240,038	237,302
Available for Sale and Equity Securities	124,269	128,201
Investments in Affiliated Funds, at fair value	6,537	6,366
Investment in Unconsolidated Affiliate	55,041	104,673
Goodwill	115,602	115,599
Intangible Assets, net of accumulated amortization of $33,226 and $30,261	52,567	55,532
Deferred Contract Costs	37,505	37,928
Deferred Income Taxes	9,993	4,936
Other Assets, net	38,323	33,687
Total Assets	2,318,494	2,383,553
Current Liabilities:
Accounts payable	14,160	13,283
Accrued liabilities	233,684	359,363
Current portion of long-term operating lease liabilities	10,331	10,344
Deferred revenue	14,330	14,893
Total Current Liabilities	272,505	397,883
Long-term Income Taxes Payable	803	803
Long-term Operating Lease Liabilities	17,657	18,786
Other Long-term Liabilities	13,195	12,257
Total Liabilities	304,160	429,729
Commitments and Contingencies
Shareholders' Equity:
Common stock, $0.01 par value, 750,000 shares authorized; 133,268 and 134,162 shares issued and outstanding	1,333	1,342
Capital in excess of par value	1,327,591	1,307,162
Retained earnings	729,988	694,287
Accumulated other comprehensive loss, net	(44,578)	(48,967)
Total Shareholders' Equity	2,014,334	1,953,824
Total Liabilities and Shareholders' Equity	$ 2,318,494	$ 2,383,553

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 721	$ 901
Property and equipment, accumulated depreciation	449,628	440,861
Capitalized Software, accumulated amortization	593,049	586,744
Intangible Assets, accumulated amortization	$ 33,226	$ 30,261
Shareholders' Equity:
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares issued (in shares)	133,268,000	134,162,000
Common stock, shares outstanding (in shares)	133,268,000	134,162,000

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenues:
Revenues	$ 469,119	$ 581,443
Expenses:
Subadvisory, distribution and other asset management costs	47,379	53,128
Software royalties and other information processing costs	7,293	7,547
Compensation, benefits and other personnel	173,415	160,484
Stock-based compensation	8,074	10,566
Consulting, outsourcing and professional fees	61,104	62,491
Data processing and computer related	33,340	29,816
Facilities, supplies and other costs	18,792	17,627
Amortization	9,424	16,887
Depreciation	8,531	8,098
Total expenses	367,352	366,644
Income from operations	101,767	214,799
Net gain (loss) from investments	744	(489)
Interest and dividend income	8,778	848
Interest expense	(141)	(250)
Equity in earnings of unconsolidated affiliate	28,879	32,459
Income before income taxes	140,027	247,367
Income taxes	33,012	57,059
Net income	$ 107,015	$ 190,308
Basic earnings per common share (in USD per share)	$ 0.80	$ 1.38
Shares used to compute basic earnings per share (in shares)	134,020	137,935
Diluted earnings per common share (in USD per share)	$ 0.79	$ 1.36
Shares used to compute diluted earnings per share (in shares)	135,311	139,712
Asset management, administration and distribution fees
Revenues:
Revenues	$ 371,829	$ 394,097
Information processing and software servicing fees
Revenues:
Revenues	$ 97,290	$ 187,346

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 107,015	$ 190,308
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	3,067	(4,558)
Unrealized gain (loss) on investments:
Unrealized gains (losses) during the period, net of income taxes of $(385) and $1,186	1,287	(3,969)
Reclassification adjustment for losses realized in net income, net of income taxes of $(11) and $(57)	35	189
Total other comprehensive income (loss), net of tax	4,389	(8,338)
Comprehensive income	$ 111,404	$ 181,970

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Unrealized gains during the period, taxes	$ (385)	$ 1,186
Reclassification adjustment for losses realized in net income, taxes	$ (11)	$ (57)

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Capital In Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2021		138,449
Beginning balance at Dec. 31, 2021	$ 1,860,763	$ 1,384	$ 1,246,608	$ 632,614	$ (19,843)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	190,308			190,308
Other comprehensive income (loss)	(8,338)				(8,338)
Purchase and retirement of common stock (in shares)		(1,713)
Purchase and retirement of common stock	(100,090)	$ (17)	(10,723)	(89,350)
Issuance of common stock under employee stock purchase plan (in shares)		23
Issuance of common stock under employee stock purchase plan	1,168	$ 0	1,168
Issuance of common stock under share-based award plans (in shares)		460
Issuance of common stock under share-based award plans	18,706	$ 5	18,701
Stock-based compensation	10,566		10,566
Ending balance (in shares) at Mar. 31, 2022		137,219
Ending balance at Mar. 31, 2022	$ 1,973,083	$ 1,372	1,266,320	733,572	(28,181)
Beginning balance (in shares) at Dec. 31, 2022	134,162	134,162
Beginning balance at Dec. 31, 2022	$ 1,953,824	$ 1,342	1,307,162	694,287	(48,967)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	107,015			107,015
Other comprehensive income (loss)	4,389				4,389
Purchase and retirement of common stock (in shares)		(1,361)
Purchase and retirement of common stock	(80,332)	$ (14)	(9,004)	(71,314)
Issuance of common stock under employee stock purchase plan (in shares)		24
Issuance of common stock under employee stock purchase plan	1,203		1,203
Issuance of common stock under share-based award plans (in shares)		443
Issuance of common stock under share-based award plans	20,161	$ 5	20,156
Stock-based compensation	$ 8,074		8,074
Ending balance (in shares) at Mar. 31, 2023	133,268	133,268
Ending balance at Mar. 31, 2023	$ 2,014,334	$ 1,333	$ 1,327,591	$ 729,988	$ (44,578)

Consolidated Condensed Statemen

Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income	$ 107,015	$ 190,308
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1)	7,349	70,119
Net cash provided by operating activities	114,364	260,427
Cash flows from investing activities:
Additions to property and equipment	(10,640)	(9,283)
Additions to capitalized software	(9,041)	(6,589)
Purchases of marketable securities	(21,777)	(49,333)
Prepayments and maturities of marketable securities	28,387	35,397
Sales of marketable securities	0	48
Other investing activities	(3,917)	(2,000)
Net cash used in investing activities	(16,988)	(31,760)
Cash flows from financing activities:
Repayments under revolving credit facility	0	(10,000)
Payment of contingent consideration	(904)	(868)
Purchase and retirement of common stock	(81,214)	(100,155)
Proceeds from issuance of common stock	21,364	19,874
Payment of dividends	(57,835)	(55,503)
Net cash used in financing activities	(118,589)	(146,652)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,561	(5,591)
Net (decrease) increase in cash, cash equivalents and restricted cash	(18,652)	76,424
Cash, cash equivalents and restricted cash, beginning of period	853,359	831,758
Cash, cash equivalents and restricted cash, end of period	$ 834,707	$ 908,182

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Nature of Operations SEI Investments Company (the Company), a Pennsylvania corporation, provides comprehensive platforms, services and infrastructure–encompassing technology, operational, and investment management services–to help wealth managers, financial advisors, investment managers, family offices, institutional and private investors create and manage wealth. Investment processing platforms provide technologies and business process outsourcing services for wealth managers. These solutions include investment advisory, client relationship, and other technology-enabled capabilities for the front office; administrative and investment services for the middle office; and accounting and processing services for the back office. Revenues from investment processing platforms are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Investment operations platforms provide business process outsourcing services for investment managers and asset owners. These platforms support a broad range of traditional and alternative investments and provide technology-enabled information analytics and investor capabilities for the front office; administrative and investment services for the middle office; and fund administration and accounting services for the back office. Revenues from investment operations platforms are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment management platforms provide comprehensive solutions for managing personal and institutional wealth. These platforms include goals-based investment strategies; SEI-sponsored investment products, including mutual funds, collective investment products, alternative investment portfolios and separately managed accounts (SMA); and other market-specific advice, technology and operational components. These platforms are offered to wealth managers as part of a complete goals-based investment program for their end-investors. For institutional investors, the Company provides Outsourced Chief Investment Officer (OCIO) solutions and Enhanced Chief Investment Officer (ECIO) solutions that include investment management programs, as well as advisory and administrative services. Revenues from investment management platforms 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, 2023, the results of operations for the three months ended March 31, 2023 and 2022, and cash flows for the three months ended March 31, 2023 and 2022. 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, 2022. There have been no significant changes in significant accounting policies during the three months ended March 31, 2023 as compared to the significant accounting policies described in the Company's Annual Report on Form 10-K for the year ended December 31, 2022. Variable Interest Entities 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 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 $5,561 and $11,185 in fees during the three months ended March 31, 2023 and 2022, respectively. Revenue Recognition Revenue is recognized when the transfer of control of promised goods or services under the terms of a contract with customers are satisfied in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those promised goods or services. Certain portions of the Company’s revenues involve a third party in providing goods or services to its customers. In such circumstances, the Company must determine whether the nature of its promise to the customer is to provide the underlying goods or services (the Company is the principal in the transaction and reports the transaction gross) or to arrange for a third party to provide the underlying goods or services (the entity is the agent in the transaction and reports the transaction net). See Note 13 for related disclosures regarding revenue recognition. Cash and Cash Equivalents Cash and cash equivalents includes $341,216 and $305,434 at March 31, 2023 and December 31, 2022, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds. Restricted Cash Restricted cash includes $250 at March 31, 2023 and December 31, 2022 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $102 and $101 at March 31, 2023 and December 31, 2022, 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 (SEC) for broker-dealers. Capitalized Software The Company capitalized $9,041 and $6,589 of software development costs during the three months ended March 31, 2023 and 2022, respectively. The Company's software development costs primarily relate to significant enhancements to the SEI Wealth Platform SM (SWP). As of March 31, 2023, the net book value of SWP was $224,551 . The net book value includes $10,586 of capitalized software development costs in-progress associated with future releases of SWP. Capitalized software development costs in-progress associated with future releases of SWP were $14,217 as of December 31, 2022. SWP has a weighted average remaining life of 9.6 years. Amortization expense for SWP was $6,158 and $12,104 during the three months ended March 31, 2023 and 2022, respectively. The Company also capitalized $4,307 of software development costs during the three months ended March 31, 2023 related to a new platform for the Investment Managers segment. Capitalized software development costs in-progress associated with this platform were $13,864 as of March 31, 2023. The platform 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, 2023 and 2022 are: Three Months Ended March 31, 2023 2022 Net income $ 107,015 $ 190,308 Shares used to compute basic earnings per common share 134,020,000 137,935,000 Dilutive effect of stock options 1,291,000 1,777,000 Shares used to compute diluted earnings per common share 135,311,000 139,712,000 Basic earnings per common share $ 0.80 $ 1.38 Diluted earnings per common share $ 0.79 $ 1.36 During the three months ended March 31, 2023 and 2022, employee stock options to purchase 11,273,000 and 12,218,000 shares of common stock with an average exercise price of $61.28 and $60.28, 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 not have been satisfied if the reporting date was the end of the contingency period or the options' 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. Recently Adopted Accounting Pronouncements In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805) Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (ASU 2021-08). This update amends Topic 805 to add contract assets and contract liabilities to the list of exceptions to the recognition and measurement principles that apply to business combinations and to require that an entity (acquirer) recognize and measure contract assets and contract liabilities in accordance with ASC 606. The Company adopted ASU 2021-08 on January 1, 2023. There was no material impact to the Company's consolidated financial statements from the implementation of ASU 2021-08. 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: 2023 2022 Net income $ 107,015 $ 190,308 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 8,531 8,098 Amortization 9,424 16,887 Equity in earnings of unconsolidated affiliate (28,879) (32,459) Distributions received from unconsolidated affiliate 29,219 32,961 Stock-based compensation 8,074 10,566 Provision for losses on receivables (180) (214) Deferred income tax expense (5,452) (10,908) Net (gain) loss from investments (744) 489 Change in other long-term liabilities 938 1,138 Change in other assets (783) (706) Contract costs capitalized, net of amortization 423 389 Other 123 1,228 Change in current assets and liabilities (Increase) decrease in Receivables from investment products 6,270 1,452 Receivables (962) 3,979 Other current assets (2,261) (2,556) Advances due from unconsolidated affiliate 49,292 54,636 (Decrease) increase in Accounts payable 877 (2,273) Accrued liabilities (65,998) (18,078) Deferred revenue (563) 5,490 Total adjustments 7,349 70,119 Net cash provided by operating activities $ 114,364 $ 260,427

Investment In Unconsolidated Af

Investment In Unconsolidated Affiliate	3 Months Ended
	Mar. 31, 2023
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 investment products. The Company's partnership interest in LSV as of March 31, 2023 was 38.6%. The Company accounts for its interest in LSV using the equity method because of its less than 50% 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, 2023, the Company’s total investment in LSV was $55,041. The Company receives partnership distributions from LSV on a quarterly basis. The Company received partnership distributions from LSV of $29,219 and $32,961 in the three months ended March 31, 2023 and 2022, respectively. As such, the Company considers these distribution payments as returns on investment rather than returns of the Company's original investment in LSV and has therefore classified the associated cash inflows as an operating activity on the Consolidated Statements of Cash Flows. The Company’s proportionate share in the earnings of LSV was $28,879 and $32,459 during the three months ended March 31, 2023 and 2022, respectively. These tables contain condensed financial information of LSV: Condensed Statement of Operations Three Months Ended March 31, 2023 2022 Revenues $ 98,192 $ 108,450 Net income 74,774 83,791 Condensed Balance Sheets March 31, 2023 December 31, 2022 Current assets $ 118,770 $ 158,326 Non-current assets 6,481 6,019 Total assets $ 125,251 $ 164,345 Current liabilities $ 39,302 $ 77,306 Non-current liabilities 2,839 3,050 Partners’ capital 83,110 83,989 Total liabilities and partners’ capital $ 125,251 $ 164,345

Composition of Certain Financia

Composition of Certain Financial Statement Captions	3 Months Ended
	Mar. 31, 2023
Items Included in Consolidated Statement of Financial Condition [Abstract]
Composition of Certain Financial Statement Captions	Composition of Certain Financial Statement Captions Receivables Receivables on the accompanying Consolidated Balance Sheets consist of: March 31, 2023 December 31, 2022 Trade receivables $ 102,590 $ 110,722 Fees earned, not billed 343,823 320,700 Other receivables 12,534 26,563 458,947 457,985 Less: Allowance for doubtful accounts (721) (901) $ 458,226 $ 457,084 Fees earned, not billed represents receivables from contracts with customers 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 an extended valuation process. Billings to these clients occur once the asset valuation processes are completed. 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, 2023 December 31, 2022 Buildings $ 210,772 $ 210,626 Equipment 185,813 179,318 Land 26,439 26,439 Purchased software 162,352 160,714 Furniture and fixtures 22,092 21,956 Leasehold improvements 21,500 20,879 Construction in progress 3,867 1,958 632,835 621,890 Less: Accumulated depreciation (449,628) (440,861) Property and Equipment, net $ 183,207 $ 181,029 The Company recognized $8,531 and $8,098 in depreciation expense related to property and equipment for the three months ended March 31, 2023 and 2022, respectively. Deferred Contract Costs Deferred contract costs, which primarily consist of deferred sales commissions, were $37,505 and $37,928 as of March 31, 2023 and December 31, 2022, respectively. The Company deferred expenses related to contract costs of $1,744 and $3,519 during the three months ended March 31, 2023 and 2022, respectively. Amortization expense related to deferred contract costs were $2,167 and $3,908 during the three months ended March 31, 2023 and 2022, respectively. Amortization expense during the three months ended March 31, 2022 includes $1,784 in expense accelerated as a result of the termination of a contractual agreement with a significant client (See Note 13). Amortization expense related to deferred contract costs is included in Compensation, benefits and other personnel on the accompanying Consolidated Statements of Operations. There were no material impairment losses in relation to deferred contract costs during the three months ended March 31, 2023. Accrued Liabilities Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: March 31, 2023 December 31, 2022 Accrued employee compensation $ 47,950 $ 100,566 Accrued employee benefits and other personnel 4,394 9,852 Accrued voluntary separation program 36,091 53,821 Accrued consulting, outsourcing and professional fees 37,822 37,009 Accrued sub-advisory, distribution and other asset management fees 48,225 52,916 Accrued dividend payable — 58,051 Accrued income taxes 15,930 — Other accrued liabilities 43,272 47,148 Total accrued liabilities $ 233,684 $ 359,363

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value MeasurementsThe 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 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 2023 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 for our Level 1 and Level 2 financial assets during the three months ended March 31, 2023 were consistent with those as described in the Company's Annual Report on Form 10-K at December 31, 2022. The Company had no Level 3 financial assets at March 31, 2023 or December 31, 2022 that were required to be measured at fair value on a recurring basis. Level 3 financial liabilities at March 31, 2023 and December 31, 2022 consist entirely of the estimated contingent consideration resulting from an acquisition (See Note 12). The fair value of the contingent consideration was determined using a Monte-Carlo simulation model. Key assumptions for the Monte-Carlo simulation model include expected revenues, expected volatility, risk-free rate and other factors. There were no transfers of financial assets between levels within the fair value hierarchy during the three months ended March 31, 2023. The fair value of certain financial assets of the Company was determined using the following inputs: Fair Value Measurements at the End of the Reporting Period Using Assets March 31, 2023 Quoted Prices in Significant Equity securities $ 11,334 $ 11,334 $ — Available-for-sale debt securities 112,935 — 112,935 Fixed-income securities owned 31,779 — 31,779 Investment funds sponsored by LSV (1) 6,537 $ 162,585 $ 11,334 $ 144,714 Fair Value Measurements at the End of the Reporting Period Using Assets December 31, 2022 Quoted Prices in Significant Equity securities $ 10,900 $ 10,900 $ — Available-for-sale debt securities 117,301 — 117,301 Fixed-income securities owned 32,148 — 32,148 Investment funds sponsored by LSV (1) 6,366 $ 166,715 $ 10,900 $ 149,449

Marketable Securities

Marketable Securities	3 Months Ended
	Mar. 31, 2023
Marketable Securities [Abstract]
Marketable Securities	Marketable Securities Marketable securities include investments in money market funds and commercial paper classified as cash equivalents, available-for-sale debt securities, investments in SEI-sponsored and non-SEI-sponsored mutual funds, equities, investments in funds sponsored by LSV and securities owned by SIDCO. Cash Equivalents Investments in money market funds and commercial paper classified as cash equivalents had a fair value of $503,582 and $450,240 at March 31, 2023 and December 31, 2022, respectively. There were no material unrealized or realized gains or losses from these investments during the three months ended March 31, 2023 and 2022. Investments in money market funds and commercial paper are Level 1 assets. Available for Sale and Equity Securities Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of: At March 31, 2023 Cost Gross Gross Fair Available-for-sale debt securities $ 123,288 $ — $ (10,353) $ 112,935 SEI-sponsored mutual funds 6,216 89 (34) 6,271 Equities and other mutual funds 5,057 6 — 5,063 $ 134,561 $ 95 $ (10,387) $ 124,269 At December 31, 2022 Cost Gross Gross Fair Available-for-sale debt securities $ 129,372 $ — $ (12,071) $ 117,301 SEI-sponsored mutual funds 6,207 — (176) 6,031 Equities and other mutual funds 5,026 — (157) 4,869 $ 140,605 $ — $ (12,404) $ 128,201 Net unrealized losses at March 31, 2023 of available-for-sale debt securities were $7,972 (net of income tax benefit of $2,381). Net unrealized losses at December 31, 2022 of available-for-sale debt securities were $9,294 (net of income tax benefit of $2,777). These unrealized losses are associated with the Company’s investments in mortgage-backed securities issued by GNMA and were caused by interest rate increases (See Note 4). The contractual cash flows of these securities are guaranteed by an agency of the U.S. government. Accordingly, it is expected that the securities would not be settled at a price less than the amortized cost bases of the Company's investments. The Company does not intend to sell the investments and it is not likely that the Company will be required to sell the investments before recovery of their amortized cost bases. 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 losses of $46 and $246 from available-for-sale debt securities during the three months ended March 31, 2023 and 2022, respectively. There were no gross realized gains from available-for-sale debt securities during the three months ended March 31, 2023 and 2022. Realized losses from available-for-sale debt securities, including amounts reclassified from accumulated comprehensive loss, are reflected in Net gain (loss) from investments on the accompanying Consolidated Statements of Operations. There were gross realized gains of $32 and gross realized losses of $10 from mutual funds and equities during the three months ended March 31, 2023. There were gross realized gains of $5 and gross realized losses of $579 from mutual funds and equities during the three months ended March 31, 2022. Gains and losses from mutual funds and equities 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 funds had a fair value of $6,537 and $6,366 at March 31, 2023 and December 31, 2022, respectively. The Company recognized unrealized gains of $171 and $354 during the three months ended March 31, 2023 and 2022, 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 $31,779 and $32,148 at March 31, 2023 and December 31, 2022, respectively. There were no material net gains or losses related to the securities during the three months ended March 31, 2023 and 2022.

Line of Credit

Line of Credit	3 Months Ended
	Mar. 31, 2023
Line of Credit Facility [Abstract]
Line of Credit	Line of Credit The Company has a five-year $325,000 Credit Agreement (the Credit Facility) with Wells Fargo Bank, N.A., and a syndicate of other lenders. The Credit Facility is scheduled to expire in April 2026, 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% to 1.00% or the London InterBank Offered Rate (LIBOR) plus a premium that can range from 1.25% to 2.00% 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%, b) the prime commercial lending rate of Wells Fargo, c) the applicable LIBOR plus 1.00%, or d) 0%. The Credit Facility includes fallback language clearly defining an alternative reference rate which provides for specified replacement rates, including the Secured Overnight Financing Rate (SOFR), upon a LIBOR cessation event. 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% of the amount of the unused portion to 0.30%, 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 Company may issue up to $15,000 in letters of credit under the terms of the Credit Facility. The Company pays a periodic commission fee of 1.25% plus an issuance fee of 0.20% of the aggregate face amount of the outstanding letters of credit issued under the Credit Facility. The Credit Facility contains covenants with restrictions on the ability of the Company to do transactions with affiliates other than wholly-owned subsidiaries or to incur liens or certain types of indebtedness 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. 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 was in compliance with all covenants of the Credit Facility during the three months ended March 31, 2023. On April 17, 2023, the Company and the lenders amended the Credit Facility to add SOFR as an alternative reference rate for borrowings in place of LIBOR. All other terms and conditions of the original agreement remain in effect. As of April 18, 2023, the Company had outstanding letters of credit of $4,866 under the Credit Facility. These letters of credit were issued primarily for the expansion of the Company's headquarters and are scheduled to expire during 2023. The amount of the Credit Facility that is available for general corporate purposes as of April 18, 2023 was $320,134.

Shareholders' Equity

Shareholders' Equity	3 Months Ended
	Mar. 31, 2023
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Shareholders’ Equity Stock-Based Compensation The Company has only non-qualified stock options and restricted stock units outstanding under its equity compensation plans. The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended March 31, 2023 and 2022, respectively, as follows: Three Months Ended March 31, 2023 2022 Stock-based compensation expense $ 8,074 $ 10,566 Less: Deferred tax benefit (1,492) (2,096) Stock-based compensation expense, net of tax $ 6,582 $ 8,470 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% when a specified financial vesting target is achieved, and the remaining 50% when a second, higher specified financial vesting target is achieved. Options vest as a result of achievement of the financial vesting targets. Options granted in December 2017 and thereafter include a service condition which requires a minimum two period, or reversed. This may cause volatility in the recognition of stock-based compensation expense in future periods and could materially affect the Company’s earnings. The Company revised its estimate of when some vesting targets are expected to be achieved. This change in management's estimate resulted in a decrease of $694 in stock-based compensation expense during the three months ended March 31, 2023. As of March 31, 2023, there was approximately $111,182 of unrecognized compensation cost remaining related to unvested employee stock options and restricted stock units 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, 2023 was $6,564. The total options exercisable as of March 31, 2023 had an intrinsic value of $57,295. 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, 2023 and the weighted average exercise price of the options. The market value of the Company’s common stock as of March 31, 2023 was $57.55 as reported by the Nasdaq Stock Market, LLC. The weighted average exercise price of the options exercisable as of March 31, 2023 was $52.97. Total options that were outstanding as of March 31, 2023 were 18,001,000 . Total options that were exercisable as of March 31, 2023 were 8,599,000 . Common Stock Buyback The Company’s Board of Directors, under multiple authorizations, has authorized the repurchase of common stock on the open market or through private transactions. The Company purchased 1,361,000 shares at a total cost of $80,332 during the three months ended March 31, 2023, 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, 2023, the Company had approximately $12,516 of authorization remaining for the purchase of common stock under the program. On April 18, 2023, the Company's Board of Directors approved an increase in the stock repurchase program by an additional $250,000, increasing the available authorization to approximately $262,516 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.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The components of Accumulated other comprehensive loss, net of tax, are as follows: Foreign Currency Translation Adjustments Unrealized Accumulated Other Comprehensive Loss Balance, January 1, 2023 $ (39,673) $ (9,294) $ (48,967) Other comprehensive income before reclassifications 3,067 1,287 4,354 Amounts reclassified from accumulated other comprehensive loss — 35 35 Net current-period other comprehensive income 3,067 1,322 4,389 Balance, March 31, 2023 $ (36,606) $ (7,972) $ (44,578)

Business Segment Information

Business Segment Information	3 Months Ended
	Mar. 31, 2023
Segment Reporting [Abstract]
Business Segment Information	Business Segment Information The Company’s reportable business segments are: Private Banks – Provides outsourced investment processing and investment management platforms to banks and trust institutions, independent wealth advisers and financial advisors worldwide; Investment Advisors – Provides investment management and investment processing platforms to affluent investors through a network of independent registered investment advisors, financial planners and other investment professionals in the United States; Institutional Investors – Provides Outsourced Chief Investment Officer and Enhanced Chief Investment Officer solutions, including investment management and administrative outsourcing platforms to retirement plan sponsors, healthcare systems, higher education and other not-for-profit organizations worldwide; Investment Managers – Provides investment operations outsourcing platforms to fund companies, banking institutions, traditional and non-traditional investment managers worldwide and family offices in the United States; and Investments in New Businesses – Focuses on providing investment management solutions to ultra-high-net-worth families residing in the United States; developing network and data protection services; modularizing larger technology platforms; entering new markets; and conducting other research and development activities. The information in the following tables is derived from internal financial reporting used for corporate management purposes. There are no inter-segment revenues for the three months ended March 31, 2023 and 2022. Assets are not allocated to segments for internal reporting purposes. 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, 2022. The following tables highlight certain financial information about each of the business segments for the three months ended March 31, 2023 and 2022: Private Banks Investment Institutional Investment Investments Total For the Three Months Ended March 31, 2023 Revenues $ 122,603 $ 106,538 $ 74,290 $ 160,686 $ 5,002 $ 469,119 Expenses 114,276 63,546 40,868 105,866 11,644 336,200 Operating profit (loss) $ 8,327 $ 42,992 $ 33,422 $ 54,820 $ (6,642) $ 132,919 Private Investment Institutional Investment Investments Total For the Three Months Ended March 31, 2022 Revenues $ 213,548 $ 119,230 $ 86,839 $ 156,901 $ 4,925 $ 581,443 Expenses 121,955 64,520 45,358 98,837 11,950 342,620 Operating profit (loss) $ 91,593 $ 54,710 $ 41,481 $ 58,064 $ (7,025) $ 238,823 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, 2023 and 2022 is as follows: 2023 2022 Total operating profit from segments $ 132,919 $ 238,823 Corporate overhead expenses (31,152) (24,024) Income from operations $ 101,767 $ 214,799 The following tables provide additional information for the three months ended March 31, 2023 and 2022 pertaining to the business segments: Capital Expenditures (1) Depreciation 2023 2022 2023 2022 Private Banks $ 9,071 $ 7,222 $ 5,354 $ 5,106 Investment Advisors 4,339 3,027 468 456 Institutional Investors 648 949 282 289 Investment Managers 4,606 4,024 2,155 2,020 Investments in New Businesses 342 205 68 44 Total from business segments $ 19,006 $ 15,427 $ 8,327 $ 7,915 Corporate overhead 615 445 204 183 $ 19,621 $ 15,872 $ 8,531 $ 8,098 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2023 2022 Private Banks $ 4,646 $ 8,539 Investment Advisors 1,818 3,233 Institutional Investors 1,824 2,283 Investment Managers 927 2,576 Investments in New Businesses 145 185 Total from business segments $ 9,360 $ 16,816 Corporate overhead 64 71 $ 9,424 $ 16,887

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The gross liability for unrecognized tax benefits at March 31, 2023 and December 31, 2022 was $15,984 and $15,204, respectively, exclusive of interest and penalties, of which $15,299 and $14,431 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, 2023 and December 31, 2022, the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $1,344 and $1,118, respectively. March 31, 2023 December 31, 2022 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 15,984 $ 15,204 Interest and penalties on unrecognized benefits 1,344 1,118 Total gross uncertain tax positions $ 17,328 $ 16,322 Amount included in Current liabilities $ 4,133 $ 4,065 Amount included in Other long-term liabilities 13,195 12,257 $ 17,328 $ 16,322 The effective income tax rate for the three months ended March 31, 2023 and 2022 differs from the federal income tax statutory rate due to the following: Three Months Ended March 31, 2023 2022 Statutory rate 21.0 % 21.0 % State taxes, net of federal tax benefit 2.9 2.9 Foreign tax expense and tax rate differential (0.1) (0.1) Tax benefit from stock option exercises (0.2) (0.4) Other, net — (0.3) 23.6 % 23.1 % The increase in the Company's effective tax rate for the three months ended March 31, 2023 was primarily due to decreased tax benefits related to the lower volume of stock option exercises and a decrease in credits associated with research and development as compared to the prior year period. 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 2019 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2015. The Company estimates it will recognize $4,133 of gross unrecognized tax benefits. This amount is expected to be paid within one year or to be removed at 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

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In the ordinary course of business, the Company from time to time enters into contracts containing indemnification obligations of the Company. These obligations may require the Company to make payments to another party upon the occurrence of certain events including the failure by the Company to meet its performance obligations under the contract. These contractual indemnification provisions are often standard contractual terms of the nature customarily found in the type of contracts entered into by the Company. In many cases, there are no stated or notional amounts included in the indemnification provisions. There are no amounts reflected on the Consolidated Balance Sheets as of March 31, 2023 and December 31, 2022 related to these indemnifications. Legal Proceedings The Company is party to various actions and claims arising in the normal course of business that the Company does not believe are material. The Company believes that the ultimate resolution of these matters will not have a material adverse effect on the Company's financial position or the manner in which the Company conducts its business. Currently, the Company does not believe the amount of losses associated with these matters can be estimated. While the Company does not believe that the amount of such losses will, when liquidated or estimable, be material to its financial position, the assumptions may be incorrect and any such loss could have a material adverse effect on the Company's results of operations or the manner in which the Company conducts its business in the period(s) during which the underlying matters are resolved.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets The changes in the carrying amount of the Company's goodwill by segment are as follows: Institutional Investors Investment Managers Investments in New Businesses Total Balance, December 31, 2022 $ 47,108 $ 56,992 $ 11,499 $ 115,599 Foreign currency translation adjustments — 3 — 3 Balance, March 31, 2023 $ 47,108 $ 56,995 $ 11,499 $ 115,602 In April 2018, the Company acquired all ownership interests of Huntington Steele, LLC (Huntington Steele). The total purchase price for Huntington Steele included a contingent purchase price payable to the sellers which is determined at various intervals occurring between 2019 and 2023. The Company made payments of $904 and $868 during the three months ended March 31, 2023 and 2022, respectively, to the sellers. As of March 31, 2023, the remaining amount of the contingent consideration of $8,777 is included in Accrued liabilities on the accompanying Balance Sheet. Beginning in April 2023, the Company or the sellers can demand immediate payment of the contingent consideration. As of April 18, 2023, neither party has invoked the demand for payment of the contingent consideration. The Company recognized $3,055 and $3,253 of amortization expense related to acquired intangible assets during the three months ended March 31, 2023 and 2022, respectively.

Revenues from Contracts with Cu

Revenues from Contracts with Customers	3 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenues from Contracts with Customers	Revenues from Contracts with CustomersThe Company’s principal sources of revenues are: (1) asset management, administration and distribution fees primarily earned based upon a contractual percentage of net assets under management or administration; and (2) information processing and software servicing fees that are either recurring and primarily earned based upon the number of trust accounts being serviced or a percentage of the market value of the clients' assets processed on the Company's platforms, or non-recurring and based upon project-oriented contractual agreements related to client implementations. Disaggregation of Revenue The following tables provide additional information pertaining to our revenues disaggregated by major product line and primary geographic market based on the location of the use of the products or services for each of the business segments for the three months ended March 31, 2023 and 2022: Private Banks Investment Institutional Investment Investments Total Major Product Lines: For the Three Months Ended March 31, 2023 Investment management fees from pooled investment products $ 32,221 $ 60,605 $ 11,283 $ 126 $ 338 $ 104,573 Investment management fees from investment management agreements 486 40,666 58,935 — 4,217 104,304 Investment operations fees 346 — — 147,194 — 147,540 Investment processing fees - PaaS 57,585 — — — — 57,585 Investment processing fees - SaaS 26,817 — 2,651 4,121 — 33,589 Professional services fees 4,086 — — 1,514 — 5,600 Account fees and other 1,062 5,267 1,421 7,731 447 15,928 Total revenues $ 122,603 $ 106,538 $ 74,290 $ 160,686 $ 5,002 $ 469,119 Primary Geographic Markets: United States $ 80,170 $ 106,538 $ 62,218 $ 146,272 $ 5,002 $ 400,200 United Kingdom 27,846 — 9,095 — — 36,941 Canada 10,090 — 1,369 — — 11,459 Ireland 4,497 — 1,608 9,025 — 15,130 Luxembourg — — — 5,389 — 5,389 Total revenues $ 122,603 $ 106,538 $ 74,290 $ 160,686 $ 5,002 $ 469,119 Private Investment Institutional Investment Investments Total Major Product Lines: For the Three Months Ended March 31, 2022 Investment management fees from pooled investment products $ 33,118 $ 71,993 $ 13,866 $ 84 $ 367 $ 119,428 Investment management fees from investment management agreements 255 42,008 68,460 — 4,126 114,849 Investment operations fees 360 — — 145,379 — 145,739 Investment processing fees - PaaS 56,455 — — — — 56,455 Investment processing fees - SaaS 29,559 — 3,110 3,658 — 36,327 Professional services fees (1) 92,729 — — 389 — 93,118 Account fees and other 1,072 5,229 1,403 7,391 432 15,527 Total revenues $ 213,548 $ 119,230 $ 86,839 $ 156,901 $ 4,925 $ 581,443 Primary Geographic Markets: United States $ 80,886 $ 119,230 $ 70,563 $ 144,025 $ 4,925 $ 419,629 United Kingdom 116,663 — 12,749 — — 129,412 Canada 11,800 — 1,242 — — 13,042 Ireland 4,199 — 2,167 9,822 — 16,188 Luxembourg — — 3,054 3,054 Other — — 118 — — 118 Total revenues $ 213,548 $ 119,230 $ 86,839 $ 156,901 $ 4,925 $ 581,443 (1) Professional services fees of the Private Banks segment includes one-time early termination fees of $88,000 related to a contractual agreement with a significant client of the Company. In accordance with Accounting Standards Codification 606, the entire amount of the fees received were recorded during the three months ended March 31, 2022 as there were no future performance obligations of the Company related to the agreement upon termination. Investment management fees from pooled investment products - Revenues associated with clients' assets invested in Company-sponsored pooled investment products. Contractual fees are stated as a percentage of the market value of assets under management and collected on a monthly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment management fees from investment management agreements - Revenues based on assets of clients of the Institutional Investors segment primarily invested in Company-sponsored products. Each client is charged an investment management fee that is stated as a percentage of the market value of all assets under management. The client is billed directly on a quarterly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Revenues associated with the separately managed account program offered through registered investment advisors located throughout the United States. The contractual fee is stated as a percentage of the market value of all assets invested in the separately managed account and collected on a quarterly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment operations fees - Revenues earned from accounting and administrative services, distribution support services and regulatory and compliance services to investment management firms and family offices. The Company contracts directly with the investment management firm or family office. The contractual fees are stated as a percentage of net assets under administration and billed when asset valuations are finalized. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment processing fees - Platform as a Service - Revenues associated with clients that outsource their entire investment operation and back-office processing functions. Through the use of the Company's proprietary platforms, the Company assumes all back-office investment processing services including investment processing, custody and safekeeping of assets, income collections, securities settlement and other related trust activities. The contractual fee is based on a monthly fee plus additional fees determined on a per-account or per-transaction basis. Contractual fees can also be stated as a percentage of the value of assets processed on the Company's platforms each month as long as the fee is in excess of a monthly contractual minimum. The client is billed directly on a monthly basis. Revenues are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Investment processing fees - Software as a Service - Revenues associated with clients of the Private Banks segment for application software services. Clients retain responsibility for all investment operations, client administration and other back-office trust operations. The contractual fee is based on a monthly fee plus additional fees determined on a per-account or per-transaction basis. The client is billed directly on a monthly basis. Revenues associated with clients of the Investment Managers segment processed on the Archway Platform SM are fees for hosted technology services to family offices and financial institutions. The Archway Platform is an integrated technology platform used for investment, operations, accounting and client reporting by these institutions. The contractual fee is based on a monthly subscription fee to access the Archway Platform along with additional fees on a per transaction basis. Revenues associated with clients of the Institutional Investors segment processed on the SEI Novus SM portfolio intelligence tool are fees for data management, performance measurement, reporting, and risk analytics. The contractual fee is based on a fixed fee to access SEI Novus and includes fees for integration of historical fund data and custom reporting. All revenues from investment processing fees are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Professional services fees - Revenues associated with the business services migration for investment processing clients of the Private Banks segment and investment operations clients of the Investment Managers segment. In addition, Professional services include other services such as business transformation consulting. Typically, fees are stated as a contractual fixed fee. The client is billed directly and fees are collected according to the terms of the agreement.. Account fees and other - Revenues associated with custody account servicing, account terminations, reimbursements received for out-of-pocket expenses, and other fees for the provision of ancillary services.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of PresentationThe accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States of America.
Variable Interest Entities	Variable Interest Entities 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 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
Revenue Recognition	Revenue RecognitionRevenue is recognized when the transfer of control of promised goods or services under the terms of a contract with customers are satisfied in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those promised goods or services. Certain portions of the Company’s revenues involve a third party in providing goods or services to its customers. In such circumstances, the Company must determine whether the nature of its promise to the customer is to provide the underlying goods or services (the Company is the principal in the transaction and reports the transaction gross) or to arrange for a third party to provide the underlying goods or services (the entity is the agent in the transaction and reports the transaction net).The Company’s principal sources of revenues are: (1) asset management, administration and distribution fees primarily earned based upon a contractual percentage of net assets under management or administration; and (2) information processing and software servicing fees that are either recurring and primarily earned based upon the number of trust accounts being serviced or a percentage of the market value of the clients' assets processed on the Company's platforms, or non-recurring and based upon project-oriented contractual agreements related to client implementations. Investment management fees from investment management agreements - Revenues based on assets of clients of the Institutional Investors segment primarily invested in Company-sponsored products. Each client is charged an investment management fee that is stated as a percentage of the market value of all assets under management. The client is billed directly on a quarterly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Revenues associated with the separately managed account program offered through registered investment advisors located throughout the United States. The contractual fee is stated as a percentage of the market value of all assets invested in the separately managed account and collected on a quarterly basis. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment operations fees - Revenues earned from accounting and administrative services, distribution support services and regulatory and compliance services to investment management firms and family offices. The Company contracts directly with the investment management firm or family office. The contractual fees are stated as a percentage of net assets under administration and billed when asset valuations are finalized. Revenues are recognized in Asset management, administration and distribution fees on the accompanying Consolidated Statements of Operations. Investment processing fees - Platform as a Service - Revenues associated with clients that outsource their entire investment operation and back-office processing functions. Through the use of the Company's proprietary platforms, the Company assumes all back-office investment processing services including investment processing, custody and safekeeping of assets, income collections, securities settlement and other related trust activities. The contractual fee is based on a monthly fee plus additional fees determined on a per-account or per-transaction basis. Contractual fees can also be stated as a percentage of the value of assets processed on the Company's platforms each month as long as the fee is in excess of a monthly contractual minimum. The client is billed directly on a monthly basis. Revenues are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Investment processing fees - Software as a Service - Revenues associated with clients of the Private Banks segment for application software services. Clients retain responsibility for all investment operations, client administration and other back-office trust operations. The contractual fee is based on a monthly fee plus additional fees determined on a per-account or per-transaction basis. The client is billed directly on a monthly basis. Revenues associated with clients of the Investment Managers segment processed on the Archway Platform SM are fees for hosted technology services to family offices and financial institutions. The Archway Platform is an integrated technology platform used for investment, operations, accounting and client reporting by these institutions. The contractual fee is based on a monthly subscription fee to access the Archway Platform along with additional fees on a per transaction basis. Revenues associated with clients of the Institutional Investors segment processed on the SEI Novus SM portfolio intelligence tool are fees for data management, performance measurement, reporting, and risk analytics. The contractual fee is based on a fixed fee to access SEI Novus and includes fees for integration of historical fund data and custom reporting. All revenues from investment processing fees are recognized in Information processing and software servicing fees on the accompanying Consolidated Statements of Operations. Professional services fees - Revenues associated with the business services migration for investment processing clients of the Private Banks segment and investment operations clients of the Investment Managers segment. In addition, Professional services include other services such as business transformation consulting. Typically, fees are stated as a contractual fixed fee. The client is billed directly and fees are collected according to the terms of the agreement.. Account fees and other - Revenues associated with custody account servicing, account terminations, reimbursements received for out-of-pocket expenses, and other fees for the provision of ancillary services.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents includes $341,216 and $305,434 at March 31, 2023 and December 31, 2022, respectively, primarily invested in SEI-sponsored open-ended money market mutual funds. 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.
Restricted Cash	Restricted CashRestricted cash includes $250 at March 31, 2023 and December 31, 2022 segregated for regulatory purposes related to trade-execution services conducted by SEI Investments (Europe) Limited. Restricted cash also includes $102 and $101 at March 31, 2023 and December 31, 2022, 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 (SEC) for broker-dealers.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805) Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (ASU 2021-08). This update amends Topic 805 to add contract assets and contract liabilities to the list of exceptions to the recognition and measurement principles that apply to business combinations and to require that an entity (acquirer) recognize and measure contract assets and contract liabilities in accordance with ASC 606. The Company adopted ASU 2021-08 on January 1, 2023. There was no material impact to the Company's consolidated financial statements from the implementation of ASU 2021-08.
Equity Method Investments	The Company accounts for its interest in LSV using the equity method because of its less than 50% 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.
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 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 2023 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.
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	Securities OwnedThe 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 Accoun_3

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Schedule of Calculation of Basic and Diluted Earnings Per Share	The calculations of basic and diluted earnings per share for the three months ended March 31, 2023 and 2022 are: Three Months Ended March 31, 2023 2022 Net income $ 107,015 $ 190,308 Shares used to compute basic earnings per common share 134,020,000 137,935,000 Dilutive effect of stock options 1,291,000 1,777,000 Shares used to compute diluted earnings per common share 135,311,000 139,712,000 Basic earnings per common share $ 0.80 $ 1.38 Diluted earnings per common share $ 0.79 $ 1.36
Schedule of 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: 2023 2022 Net income $ 107,015 $ 190,308 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 8,531 8,098 Amortization 9,424 16,887 Equity in earnings of unconsolidated affiliate (28,879) (32,459) Distributions received from unconsolidated affiliate 29,219 32,961 Stock-based compensation 8,074 10,566 Provision for losses on receivables (180) (214) Deferred income tax expense (5,452) (10,908) Net (gain) loss from investments (744) 489 Change in other long-term liabilities 938 1,138 Change in other assets (783) (706) Contract costs capitalized, net of amortization 423 389 Other 123 1,228 Change in current assets and liabilities (Increase) decrease in Receivables from investment products 6,270 1,452 Receivables (962) 3,979 Other current assets (2,261) (2,556) Advances due from unconsolidated affiliate 49,292 54,636 (Decrease) increase in Accounts payable 877 (2,273) Accrued liabilities (65,998) (18,078) Deferred revenue (563) 5,490 Total adjustments 7,349 70,119 Net cash provided by operating activities $ 114,364 $ 260,427

Investment In Unconsolidated _2

Investment In Unconsolidated Affiliate (Tables)	3 Months Ended
	Mar. 31, 2023
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Equity Method Investments	These tables contain condensed financial information of LSV: Condensed Statement of Operations Three Months Ended March 31, 2023 2022 Revenues $ 98,192 $ 108,450 Net income 74,774 83,791 Condensed Balance Sheets March 31, 2023 December 31, 2022 Current assets $ 118,770 $ 158,326 Non-current assets 6,481 6,019 Total assets $ 125,251 $ 164,345 Current liabilities $ 39,302 $ 77,306 Non-current liabilities 2,839 3,050 Partners’ capital 83,110 83,989 Total liabilities and partners’ capital $ 125,251 $ 164,345

Composition of Certain Financ_2

Composition of Certain Financial Statement Captions (Tables)	3 Months Ended
	Mar. 31, 2023
Items Included in Consolidated Statement of Financial Condition [Abstract]
Schedule of Receivables	Receivables on the accompanying Consolidated Balance Sheets consist of: March 31, 2023 December 31, 2022 Trade receivables $ 102,590 $ 110,722 Fees earned, not billed 343,823 320,700 Other receivables 12,534 26,563 458,947 457,985 Less: Allowance for doubtful accounts (721) (901) $ 458,226 $ 457,084
Schedule of Property And Equipment	Property and Equipment on the accompanying Consolidated Balance Sheets consists of: March 31, 2023 December 31, 2022 Buildings $ 210,772 $ 210,626 Equipment 185,813 179,318 Land 26,439 26,439 Purchased software 162,352 160,714 Furniture and fixtures 22,092 21,956 Leasehold improvements 21,500 20,879 Construction in progress 3,867 1,958 632,835 621,890 Less: Accumulated depreciation (449,628) (440,861) Property and Equipment, net $ 183,207 $ 181,029
Schedule of Accrued Liabilities	Accrued liabilities on the accompanying Consolidated Balance Sheets consist of: March 31, 2023 December 31, 2022 Accrued employee compensation $ 47,950 $ 100,566 Accrued employee benefits and other personnel 4,394 9,852 Accrued voluntary separation program 36,091 53,821 Accrued consulting, outsourcing and professional fees 37,822 37,009 Accrued sub-advisory, distribution and other asset management fees 48,225 52,916 Accrued dividend payable — 58,051 Accrued income taxes 15,930 — Other accrued liabilities 43,272 47,148 Total accrued liabilities $ 233,684 $ 359,363

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Fair Value Of Certain Financial Assets And Liabilities	The fair value of certain financial assets of the Company was determined using the following inputs: Fair Value Measurements at the End of the Reporting Period Using Assets March 31, 2023 Quoted Prices in Significant Equity securities $ 11,334 $ 11,334 $ — Available-for-sale debt securities 112,935 — 112,935 Fixed-income securities owned 31,779 — 31,779 Investment funds sponsored by LSV (1) 6,537 $ 162,585 $ 11,334 $ 144,714 Fair Value Measurements at the End of the Reporting Period Using Assets December 31, 2022 Quoted Prices in Significant Equity securities $ 10,900 $ 10,900 $ — Available-for-sale debt securities 117,301 — 117,301 Fixed-income securities owned 32,148 — 32,148 Investment funds sponsored by LSV (1) 6,366 $ 166,715 $ 10,900 $ 149,449

Marketable Securities (Tables)

Marketable Securities (Tables)	3 Months Ended
	Mar. 31, 2023
Marketable Securities [Abstract]
Schedule of Available For Sale and Equity Securities	Available For Sale and Equity Securities on the accompanying Consolidated Balance Sheets consist of: At March 31, 2023 Cost Gross Gross Fair Available-for-sale debt securities $ 123,288 $ — $ (10,353) $ 112,935 SEI-sponsored mutual funds 6,216 89 (34) 6,271 Equities and other mutual funds 5,057 6 — 5,063 $ 134,561 $ 95 $ (10,387) $ 124,269 At December 31, 2022 Cost Gross Gross Fair Available-for-sale debt securities $ 129,372 $ — $ (12,071) $ 117,301 SEI-sponsored mutual funds 6,207 — (176) 6,031 Equities and other mutual funds 5,026 — (157) 4,869 $ 140,605 $ — $ (12,404) $ 128,201

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2023
Stockholders' Equity Note [Abstract]
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan	The Company recognized stock-based compensation expense in its Consolidated Financial Statements in the three months ended March 31, 2023 and 2022, respectively, as follows: Three Months Ended March 31, 2023 2022 Stock-based compensation expense $ 8,074 $ 10,566 Less: Deferred tax benefit (1,492) (2,096) Stock-based compensation expense, net of tax $ 6,582 $ 8,470

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 31, 2023
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 Accumulated Other Comprehensive Loss Balance, January 1, 2023 $ (39,673) $ (9,294) $ (48,967) Other comprehensive income before reclassifications 3,067 1,287 4,354 Amounts reclassified from accumulated other comprehensive loss — 35 35 Net current-period other comprehensive income 3,067 1,322 4,389 Balance, March 31, 2023 $ (36,606) $ (7,972) $ (44,578)

Business Segment Information (T

Business Segment Information (Tables)	3 Months Ended
	Mar. 31, 2023
Segment Reporting [Abstract]
Schedule Of Financial Information About Business Segments	The following tables highlight certain financial information about each of the business segments for the three months ended March 31, 2023 and 2022: Private Banks Investment Institutional Investment Investments Total For the Three Months Ended March 31, 2023 Revenues $ 122,603 $ 106,538 $ 74,290 $ 160,686 $ 5,002 $ 469,119 Expenses 114,276 63,546 40,868 105,866 11,644 336,200 Operating profit (loss) $ 8,327 $ 42,992 $ 33,422 $ 54,820 $ (6,642) $ 132,919 Private Investment Institutional Investment Investments Total For the Three Months Ended March 31, 2022 Revenues $ 213,548 $ 119,230 $ 86,839 $ 156,901 $ 4,925 $ 581,443 Expenses 121,955 64,520 45,358 98,837 11,950 342,620 Operating profit (loss) $ 91,593 $ 54,710 $ 41,481 $ 58,064 $ (7,025) $ 238,823
Schedule of Reconciliation of Total Operating Profit Reported for Business Segments to Income from Operations in Consolidated Statements of Operations	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, 2023 and 2022 is as follows: 2023 2022 Total operating profit from segments $ 132,919 $ 238,823 Corporate overhead expenses (31,152) (24,024) Income from operations $ 101,767 $ 214,799
Schedule of Additional Information Pertaining to Business Segments	The following tables provide additional information for the three months ended March 31, 2023 and 2022 pertaining to the business segments: Capital Expenditures (1) Depreciation 2023 2022 2023 2022 Private Banks $ 9,071 $ 7,222 $ 5,354 $ 5,106 Investment Advisors 4,339 3,027 468 456 Institutional Investors 648 949 282 289 Investment Managers 4,606 4,024 2,155 2,020 Investments in New Businesses 342 205 68 44 Total from business segments $ 19,006 $ 15,427 $ 8,327 $ 7,915 Corporate overhead 615 445 204 183 $ 19,621 $ 15,872 $ 8,531 $ 8,098 (1) Capital expenditures include additions to property and equipment and capitalized software. Amortization 2023 2022 Private Banks $ 4,646 $ 8,539 Investment Advisors 1,818 3,233 Institutional Investors 1,824 2,283 Investment Managers 927 2,576 Investments in New Businesses 145 185 Total from business segments $ 9,360 $ 16,816 Corporate overhead 64 71 $ 9,424 $ 16,887

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Interest And Penalties	March 31, 2023 December 31, 2022 Gross liability for unrecognized tax benefits, exclusive of interest and penalties $ 15,984 $ 15,204 Interest and penalties on unrecognized benefits 1,344 1,118 Total gross uncertain tax positions $ 17,328 $ 16,322 Amount included in Current liabilities $ 4,133 $ 4,065 Amount included in Other long-term liabilities 13,195 12,257 $ 17,328 $ 16,322
Schedule of Effective Income Tax Rate Reconciliation	The effective income tax rate for the three months ended March 31, 2023 and 2022 differs from the federal income tax statutory rate due to the following: Three Months Ended March 31, 2023 2022 Statutory rate 21.0 % 21.0 % State taxes, net of federal tax benefit 2.9 2.9 Foreign tax expense and tax rate differential (0.1) (0.1) Tax benefit from stock option exercises (0.2) (0.4) Other, net — (0.3) 23.6 % 23.1 %

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The changes in the carrying amount of the Company's goodwill by segment are as follows: Institutional Investors Investment Managers Investments in New Businesses Total Balance, December 31, 2022 $ 47,108 $ 56,992 $ 11,499 $ 115,599 Foreign currency translation adjustments — 3 — 3 Balance, March 31, 2023 $ 47,108 $ 56,995 $ 11,499 $ 115,602

Revenues from Contracts with _2

Revenues from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	The following tables provide additional information pertaining to our revenues disaggregated by major product line and primary geographic market based on the location of the use of the products or services for each of the business segments for the three months ended March 31, 2023 and 2022: Private Banks Investment Institutional Investment Investments Total Major Product Lines: For the Three Months Ended March 31, 2023 Investment management fees from pooled investment products $ 32,221 $ 60,605 $ 11,283 $ 126 $ 338 $ 104,573 Investment management fees from investment management agreements 486 40,666 58,935 — 4,217 104,304 Investment operations fees 346 — — 147,194 — 147,540 Investment processing fees - PaaS 57,585 — — — — 57,585 Investment processing fees - SaaS 26,817 — 2,651 4,121 — 33,589 Professional services fees 4,086 — — 1,514 — 5,600 Account fees and other 1,062 5,267 1,421 7,731 447 15,928 Total revenues $ 122,603 $ 106,538 $ 74,290 $ 160,686 $ 5,002 $ 469,119 Primary Geographic Markets: United States $ 80,170 $ 106,538 $ 62,218 $ 146,272 $ 5,002 $ 400,200 United Kingdom 27,846 — 9,095 — — 36,941 Canada 10,090 — 1,369 — — 11,459 Ireland 4,497 — 1,608 9,025 — 15,130 Luxembourg — — — 5,389 — 5,389 Total revenues $ 122,603 $ 106,538 $ 74,290 $ 160,686 $ 5,002 $ 469,119 Private Investment Institutional Investment Investments Total Major Product Lines: For the Three Months Ended March 31, 2022 Investment management fees from pooled investment products $ 33,118 $ 71,993 $ 13,866 $ 84 $ 367 $ 119,428 Investment management fees from investment management agreements 255 42,008 68,460 — 4,126 114,849 Investment operations fees 360 — — 145,379 — 145,739 Investment processing fees - PaaS 56,455 — — — — 56,455 Investment processing fees - SaaS 29,559 — 3,110 3,658 — 36,327 Professional services fees (1) 92,729 — — 389 — 93,118 Account fees and other 1,072 5,229 1,403 7,391 432 15,527 Total revenues $ 213,548 $ 119,230 $ 86,839 $ 156,901 $ 4,925 $ 581,443 Primary Geographic Markets: United States $ 80,886 $ 119,230 $ 70,563 $ 144,025 $ 4,925 $ 419,629 United Kingdom 116,663 — 12,749 — — 129,412 Canada 11,800 — 1,242 — — 13,042 Ireland 4,199 — 2,167 9,822 — 16,188 Luxembourg — — 3,054 3,054 Other — — 118 — — 118 Total revenues $ 213,548 $ 119,230 $ 86,839 $ 156,901 $ 4,925 $ 581,443 (1) Professional services fees of the Private Banks segment includes one-time early termination fees of $88,000 related to a contractual agreement with a significant client of the Company. In accordance with Accounting Standards Codification 606, the entire amount of the fees received were recorded during the three months ended March 31, 2022 as there were no future performance obligations of the Company related to the agreement upon termination.

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Summary of Significant Accounting Policies [Line Items]
Cash and cash equivalents invested in SEI-sponsored money market funds	$ 834,355		$ 853,008
Restricted cash	352		351
Capitalized software development costs	9,041	$ 6,589
Net book value of capitalized software	$ 240,038		237,302
Anti-dilutive employee stock options (in shares)	11,273	12,218
Anti-dilutive employee stock options (in USD per share)	$ 61.28	$ 60.28
Investment Managers
Summary of Significant Accounting Policies [Line Items]
Capitalized software development costs	$ 4,307
Capitalized software development costs in-progress	13,864
SEI Wealth Platform
Summary of Significant Accounting Policies [Line Items]
Net book value of capitalized software	224,551
Capitalized software in progress	10,586		14,217
Amortization expense related to the SEI Wealth Platform	$ 6,158	$ 12,104
SEI Wealth Platform | Weighted Average
Summary of Significant Accounting Policies [Line Items]
Estimated useful life of the SEI Wealth Platform	9 years 7 months 6 days
SEI-Sponsored Open-Ended Money Market Mutual Funds
Summary of Significant Accounting Policies [Line Items]
Cash and cash equivalents invested in SEI-sponsored money market funds	$ 341,216		305,434
SEI Investments (Europe) Limited
Summary of Significant Accounting Policies [Line Items]
Restricted cash	250		250
SEI Investments Distribution Co. (SIDCO)
Summary of Significant Accounting Policies [Line Items]
Restricted cash	102		$ 101
SEI-Sponsored Open-Ended Money Market Mutual Funds
Summary of Significant Accounting Policies [Line Items]
Fees waived	$ 5,561	$ 11,185

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accounting Policies [Abstract]
Net income	$ 107,015	$ 190,308
Shares used to compute basic earnings per common share (in shares)	134,020	137,935
Dilutive effect of stock options (in shares)	1,291	1,777
Shares used to compute diluted earnings per common share (in shares)	135,311	139,712
Basic earnings per common share (in USD per share)	$ 0.80	$ 1.38
Diluted earnings per common share (in USD per share)	$ 0.79	$ 1.36

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accounting Policies [Abstract]
Net income	$ 107,015	$ 190,308
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	8,531	8,098
Amortization	9,424	16,887
Equity in earnings of unconsolidated affiliate	(28,879)	(32,459)
Distributions received from unconsolidated affiliate	29,219	32,961
Stock-based compensation	8,074	10,566
Provision for losses on receivables	(180)	(214)
Deferred income tax expense	(5,452)	(10,908)
Net (gain) loss from investments	(744)	489
Change in other long-term liabilities	938	1,138
Change in other assets	(783)	(706)
Contract costs capitalized, net of amortization	423	389
Other	123	1,228
Change in current assets and liabilities (Increase) decrease in
Receivables from investment products	6,270	1,452
Receivables	(962)	3,979
Other current assets	(2,261)	(2,556)
Advances due from unconsolidated affiliate	49,292	54,636
(Decrease) increase in
Accounts payable	877	(2,273)
Accrued liabilities	(65,998)	(18,078)
Deferred revenue	(563)	5,490
Total adjustments	7,349	70,119
Net cash provided by operating activities	$ 114,364	$ 260,427

Investment In Unconsolidated _3

Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Schedule of Equity Method Investments [Line Items]
Total investment in LSV	$ 55,041
Distributions received from LSV	29,219	$ 32,961
Company's share in the earnings of LSV	$ 28,879	$ 32,459
L S V Asset Management
Schedule of Equity Method Investments [Line Items]
Ownership interest in LSV	38.60%

Investment In Unconsolidated _4

Investment In Unconsolidated Affiliate (Condensed Statements of Operations of LSV) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Schedule of Equity Method Investments [Line Items]
Revenues	$ 469,119	$ 581,443
Equity Method Investment, Nonconsolidated Investee
Schedule of Equity Method Investments [Line Items]
Revenues	98,192	108,450
Net income	$ 74,774	$ 83,791

Investment in Unconsolidated _5

Investment in Unconsolidated Affiliate (Condensed Balance Sheets of LSV) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Current assets	$ 1,431,420	$ 1,453,308
Total Assets	2,318,494	2,383,553
Current liabilities	272,505	397,883
Total Liabilities and Shareholders' Equity	2,318,494	2,383,553
Equity Method Investment, Nonconsolidated Investee
Schedule of Equity Method Investments [Line Items]
Current assets	118,770	158,326
Non-current assets	6,481	6,019
Total Assets	125,251	164,345
Current liabilities	39,302	77,306
Non-current liabilities	2,839	3,050
Partners’ capital	83,110	83,989
Total Liabilities and Shareholders' Equity	$ 125,251	$ 164,345

Composition of Certain Financ_3

Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Items Included in Consolidated Statement of Financial Condition [Abstract]
Trade receivables	$ 102,590	$ 110,722
Fees earned, not billed	343,823	320,700
Other receivables	12,534	26,563
Gross receivables	458,947	457,985
Less: Allowance for doubtful accounts	(721)	(901)
Receivables, net	$ 458,226	$ 457,084

Composition of Certain Financ_4

Composition of Certain Financial Statement Captions (Property And Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Property and Equipment [Line Items]
Property and equipment, gross	$ 632,835		$ 621,890
Less: Accumulated depreciation	(449,628)		(440,861)
Property and Equipment, net	183,207		181,029
Depreciation expense	8,531	$ 8,098
Buildings
Property and Equipment [Line Items]
Property and equipment, gross	210,772		210,626
Equipment
Property and Equipment [Line Items]
Property and equipment, gross	185,813		179,318
Land
Property and Equipment [Line Items]
Property and equipment, gross	26,439		26,439
Purchased software
Property and Equipment [Line Items]
Property and equipment, gross	162,352		160,714
Furniture and fixtures
Property and Equipment [Line Items]
Property and equipment, gross	22,092		21,956
Leasehold improvements
Property and Equipment [Line Items]
Property and equipment, gross	21,500		20,879
Construction in progress
Property and Equipment [Line Items]
Property and equipment, gross	$ 3,867		$ 1,958

Composition of Certain Financ_5

Composition of Certain Financial Statement Captions (Deferred Contract Costs) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Items Included in Consolidated Statement of Financial Condition [Abstract]
Deferred contract costs	$ 37,505,000		$ 37,928,000
Capitalized contract cost, amount capitalized during period	1,744,000	$ 3,519,000
Amortization of deferred contract costs	2,167,000	3,908,000
Accelerated amortization of deferred contract costs		$ 1,784,000
Capitalized contract cost impairment	$ 0

Composition of Certain Financ_6

Composition of Certain Financial Statement Captions (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Items Included in Consolidated Statement of Financial Condition [Abstract]
Accrued employee compensation	$ 47,950	$ 100,566
Accrued employee benefits and other personnel	4,394	9,852
Accrued voluntary separation program	36,091	53,821
Accrued consulting, outsourcing and professional fees	37,822	37,009
Accrued sub-advisory, distribution and other asset management fees	48,225	52,916
Accrued dividend payable	0	58,051
Accrued income taxes	15,930	0
Other accrued liabilities	43,272	47,148
Total accrued liabilities	$ 233,684	$ 359,363

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-income securities owned	$ 31,779	$ 32,148
Assets, fair value	162,585	166,715
Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-income securities owned	0	0
Assets, fair value	11,334	10,900
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed-income securities owned	31,779	32,148
Assets, fair value	144,714	149,449
Equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	11,334	10,900
Equity securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	11,334	10,900
Equity securities | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	0	0
Available-for-sale debt securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	112,935	117,301
Available-for-sale debt securities | Quoted Prices in Active  Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	0	0
Available-for-sale debt securities | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	112,935	117,301
Investment Funds sponsored by LSV
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment funds sponsored by LSV	$ 6,537	$ 6,366

Marketable Securities (Narrativ

Marketable Securities (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Schedule of Investments [Line Items]
Cash equivalents at fair value	$ 503,582,000		$ 450,240,000
Net unrealized loss	7,972,000		9,294,000
Net unrealized gains (losses) income tax expense (benefit)	(2,381,000)		(2,777,000)
Available-for-sale securities, gross realized gains	0	$ 0
Mutual funds and equities, gross realized gains	32,000	5,000
Mutual funds and equities, gross realized loss	10,000	579,000
Other long-term investments	55,041,000		104,673,000
Securities owned	31,779,000		32,148,000
Available-for-sale debt securities
Schedule of Investments [Line Items]
Available-for-sale securities, gross realized losses	46,000	246,000
Investment Funds Sponsored by LSV
Schedule of Investments [Line Items]
Other long-term investments	6,537,000		$ 6,366,000
Unrealized gains on investments	$ 171,000	$ 354,000

Marketable Securities (Investme

Marketable Securities (Investments Available For Sale) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available for sale and equity securities, cost	$ 134,561	$ 140,605
Available for sale and equity securities, gross unrealized gains	95	0
Available for sale and equity securities, gross unrealized (losses)	(10,387)	(12,404)
Available for sale and equity securities, fair value	124,269	128,201
Available-for-sale debt securities
Debt Securities, Available-for-sale [Line Items]
Available for sale debt securities, cost	123,288	129,372
Available for sale debt securities, gross unrealized gains	0	0
Available for sale debt securities, gross unrealized (losses)	(10,353)	(12,071)
Available for sale debt securities, fair value	112,935	117,301
SEI-sponsored mutual funds
Debt Securities, Available-for-sale [Line Items]
Equity securities, FV-NI, cost	6,216	6,207
Equity securities, FV-NI, gross unrealized gains	89	0
Equity securities, FV-NI, gross unrealized (losses)	(34)	(176)
Equity securities, FV-NI, fair value	6,271	6,031
Equities and other mutual funds
Debt Securities, Available-for-sale [Line Items]
Equity securities, FV-NI, cost	5,057	5,026
Equity securities, FV-NI, gross unrealized gains	6	0
Equity securities, FV-NI, gross unrealized (losses)	0	(157)
Equity securities, FV-NI, fair value	$ 5,063	$ 4,869

Line of Credit (Details)

Line of Credit (Details) - 2021 Credit Facility	Apr. 23, 2021 USD ($) fiscalQuarter	Apr. 18, 2023 USD ($)
Line of Credit Facility [Line Items]
Debt interest rate accrual term, number of preceding fiscal quarters | fiscalQuarter	4
Subsequent Event
Line of Credit Facility [Line Items]
Letters of credit outstanding amount		$ 4,866,000
Line of Credit
Line of Credit Facility [Line Items]
Credit facility term of agreement	5 years
Credit facility maximum borrowing capacity	$ 325,000,000
Credit facility stated percentage	0%
Credit facility accordion feature, increase limit	$ 100,000,000
Line of Credit | Subsequent Event
Line of Credit Facility [Line Items]
Credit facility remaining borrowing capacity		$ 320,134,000
Line of Credit | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1%
Line of Credit | Federal Funds Rate
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	0.50%
Line of Credit | Minimum
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion	0.15%
Line of Credit | Minimum | Lender's Base Rate Plus Market Spread
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	0.25%
Line of Credit | Minimum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1.25%
Line of Credit | Maximum
Line of Credit Facility [Line Items]
Credit facility commitment fee per annum on daily unused portion	0.30%
Line of Credit | Maximum | Lender's Base Rate Plus Market Spread
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	1%
Line of Credit | Maximum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Credit facility variable interest rate basis spread	2%
Letter of Credit
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	$ 15,000,000
Credit facility, commitment fee percentage	1.25%
Credit facility, fronting fee percentage	0.20%

Shareholders' Equity (Stock-Bas

Shareholders' Equity (Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Stockholders' Equity Note [Abstract]
Stock-based compensation expense	$ 8,074	$ 10,566
Less: Deferred tax benefit	(1,492)	(2,096)
Stock-based compensation expense, net of tax	$ 6,582	$ 8,470

Shareholders' Equity (Narrative

Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Apr. 18, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase (decrease) in stock-based compensation from change in management's estimate	$ 694
Unrecognized compensation cost	111,182
Total intrinsic value of options exercised	6,564
Aggregate intrinsic value of options exercisable	$ 57,295
Market value of Company's common stock (in USD per share)	$ 57.55
Weighted average exercise price per share (in USD per share)	$ 52.97
Total options outstanding (in shares)	18,001
Total options exercisable (in shares)	8,599
Common Stock Buyback
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased and retired (in shares)	1,361
Company purchased, cost	$ 80,332
Remaining stock repurchase authorization amount	$ 12,516
Common Stock Buyback | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining stock repurchase authorization amount		$ 262,516
Additional authorized amount		$ 250,000
2014 Plan | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate	50%
2014 Plan | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate	50%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award waiting period	2 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award waiting period	4 years

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,953,824	$ 1,860,763
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income before reclassifications	4,354
Amounts reclassified from accumulated other comprehensive loss	35
Total other comprehensive income (loss), net of tax	4,389	(8,338)
Ending balance	2,014,334	1,973,083
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(48,967)	(19,843)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Total other comprehensive income (loss), net of tax	4,389	(8,338)
Ending balance	(44,578)	$ (28,181)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(39,673)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income before reclassifications	3,067
Amounts reclassified from accumulated other comprehensive loss	0
Total other comprehensive income (loss), net of tax	3,067
Ending balance	(36,606)
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(9,294)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive income before reclassifications	1,287
Amounts reclassified from accumulated other comprehensive loss	35
Total other comprehensive income (loss), net of tax	1,322
Ending balance	$ (7,972)

Business Segment Information (N

Business Segment Information (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 469,119,000	$ 581,443,000
Intersegment
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0

Business Segment Information (S

Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 469,119	$ 581,443
Expenses	336,200	342,620
Operating profit (loss)	132,919	238,823
Private Banks
Segment Reporting Information [Line Items]
Revenues	122,603	213,548
Expenses	114,276	121,955
Operating profit (loss)	8,327	91,593
Investment Advisors
Segment Reporting Information [Line Items]
Revenues	106,538	119,230
Expenses	63,546	64,520
Operating profit (loss)	42,992	54,710
Institutional Investors
Segment Reporting Information [Line Items]
Revenues	74,290	86,839
Expenses	40,868	45,358
Operating profit (loss)	33,422	41,481
Investment Managers
Segment Reporting Information [Line Items]
Revenues	160,686	156,901
Expenses	105,866	98,837
Operating profit (loss)	54,820	58,064
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues	5,002	4,925
Expenses	11,644	11,950
Operating profit (loss)	$ (6,642)	$ (7,025)

Business Segment Information (R

Business Segment Information (Reconciliation of Total Operating Profit) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Total operating profit from segments	$ 132,919	$ 238,823
Corporate overhead expenses	(31,152)	(24,024)
Income from operations	$ 101,767	$ 214,799

Business Segment Information _2

Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Capital expenditure	$ 19,621	$ 15,872
Depreciation	8,531	8,098
Amortization	9,424	16,887
Operating Segments
Segment Reporting Information [Line Items]
Capital expenditure	19,006	15,427
Depreciation	8,327	7,915
Amortization	9,360	16,816
Operating Segments | Private Banks
Segment Reporting Information [Line Items]
Capital expenditure	9,071	7,222
Depreciation	5,354	5,106
Amortization	4,646	8,539
Operating Segments | Investment Advisors
Segment Reporting Information [Line Items]
Capital expenditure	4,339	3,027
Depreciation	468	456
Amortization	1,818	3,233
Operating Segments | Institutional Investors
Segment Reporting Information [Line Items]
Capital expenditure	648	949
Depreciation	282	289
Amortization	1,824	2,283
Operating Segments | Investment Managers
Segment Reporting Information [Line Items]
Capital expenditure	4,606	4,024
Depreciation	2,155	2,020
Amortization	927	2,576
Operating Segments | Investments In New Businesses
Segment Reporting Information [Line Items]
Capital expenditure	342	205
Depreciation	68	44
Amortization	145	185
Corporate overhead
Segment Reporting Information [Line Items]
Capital expenditure	615	445
Depreciation	204	183
Amortization	$ 64	$ 71

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Income Tax Contingency [Line Items]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 15,984	$ 15,204
Unrecognized tax benefits that would affect effective tax rate	15,299	14,431
Interest and penalties on unrecognized benefits	1,344	$ 1,118
Settlement and Lapse of Statute
Income Tax Contingency [Line Items]
Unrecognized tax benefits within the next twelve months	$ 4,133

Income Taxes (Interest And Pena

Income Taxes (Interest And Penalties) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$ 15,984	$ 15,204
Interest and penalties on unrecognized benefits	1,344	1,118
Total gross uncertain tax positions	17,328	16,322
Amount included in Current liabilities	4,133	4,065
Amount included in Other long-term liabilities	13,195	12,257
Total gross uncertain tax positions	$ 17,328	$ 16,322

Income Taxes (Effective Income

Income Taxes (Effective Income Tax Rate Reconciliation) (Details)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Statutory rate	21%	21%
State taxes, net of federal tax benefit	2.90%	2.90%
Foreign tax expense and tax rate differential	(0.10%)	(0.10%)
Tax benefit from stock option exercises	(0.20%)	(0.40%)
Other, net	0%	(0.30%)
Effective income tax rate	23.60%	23.10%

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Schedule of Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 115,599
Foreign currency translation adjustments	3
Goodwill, ending balance	115,602
Institutional Investors
Goodwill [Roll Forward]
Goodwill, beginning balance	47,108
Foreign currency translation adjustments	0
Goodwill, ending balance	47,108
Investment Managers
Goodwill [Roll Forward]
Goodwill, beginning balance	56,992
Foreign currency translation adjustments	3
Goodwill, ending balance	56,995
Investments In New Businesses
Goodwill [Roll Forward]
Goodwill, beginning balance	11,499
Foreign currency translation adjustments	0
Goodwill, ending balance	$ 11,499

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 115,602		$ 115,599
Payment of contingent consideration	904	$ 868
Amortization expense	3,055	3,253
Huntington Steele, LLC
Goodwill [Line Items]
Payment of contingent consideration	904	$ 868
Contingent consideration, long-term	$ 8,777

Revenues from Contracts with _3

Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 469,119	$ 581,443
United States
Disaggregation of Revenue [Line Items]
Revenues	400,200	419,629
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	36,941	129,412
Canada
Disaggregation of Revenue [Line Items]
Revenues	11,459	13,042
Ireland
Disaggregation of Revenue [Line Items]
Revenues	15,130	16,188
Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	5,389	3,054
Other
Disaggregation of Revenue [Line Items]
Revenues		118
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	104,573	119,428
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	104,304	114,849
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	147,540	145,739
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	57,585	56,455
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	33,589	36,327
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	5,600	93,118
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	15,928	15,527
Private Banks
Disaggregation of Revenue [Line Items]
Revenues	122,603	213,548
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues	80,170	80,886
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	27,846	116,663
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues	10,090	11,800
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues	4,497	4,199
Private Banks | Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0	0
Private Banks | Other
Disaggregation of Revenue [Line Items]
Revenues		0
Private Banks | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	32,221	33,118
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	486	255
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	346	360
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	57,585	56,455
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	26,817	29,559
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	4,086	92,729
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,062	1,072
Private Banks | Professional services fees, one-time early termination fees
Disaggregation of Revenue [Line Items]
Revenues		88,000
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues	106,538	119,230
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues	106,538	119,230
Investment Advisors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0
Investment Advisors | Other
Disaggregation of Revenue [Line Items]
Revenues		0
Investment Advisors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	60,605	71,993
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	40,666	42,008
Investment Advisors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	5,267	5,229
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues	74,290	86,839
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues	62,218	70,563
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	9,095	12,749
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues	1,369	1,242
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	1,608	2,167
Institutional Investors | Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues		118
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	11,283	13,866
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	58,935	68,460
Institutional Investors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	2,651	3,110
Institutional Investors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,421	1,403
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues	160,686	156,901
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues	146,272	144,025
Investment Managers | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Ireland
Disaggregation of Revenue [Line Items]
Revenues	9,025	9,822
Investment Managers | Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	5,389	3,054
Investment Managers | Other
Disaggregation of Revenue [Line Items]
Revenues		0
Investment Managers | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	126	84
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	147,194	145,379
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	4,121	3,658
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	1,514	389
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	7,731	7,391
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues	5,002	4,925
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues	5,002	4,925
Investments In New Businesses | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0
Investments In New Businesses | Other
Disaggregation of Revenue [Line Items]
Revenues		0
Investments In New Businesses | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	338	367
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	4,217	4,126
Investments In New Businesses | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	$ 447	$ 432