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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Summary of Significant Accounting Policies [Line Items] |  |  |
Cash and cash equivalents | $ 853,008,000 | $ 831,407,000 |
Restricted cash | 351,000 | 351,000 |
Impairment charge on reclassified assets | 0 | 0 | $ 0
Capitalized software development costs | 35,293,000 | 26,037,000 | 24,119,000
Net book value of capitalized software | 237,302,000 | 243,446,000 |
Impairment charges related to capitalized software development costs | 0 | 0 | 0
Goodwill and intangible assets impairment | $ 0 | $ 0 | $ 0
Anti-dilutive employee stock options (in shares) | 12,439 | 11,755 | 9,220
Anti-dilutive employee stock options, average exercise price per share | $ 60.35 | $ 58.43 | $ 58.12
Investment Managers |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Capitalized software development costs | $ 9,558,000 |  |
SEI Wealth Platform |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Capitalized software development costs | 25,735,000 | $ 25,938,000 | $ 22,257,000
Net book value of capitalized software | 225,975,000 |  |
Capitalized software development costs in progress | 14,217,000 |  |
Amortization expense related to the SEI Wealth Platform | $ 35,638,000 | 47,769,000 | 43,853,000
Weighted Average | SEI Wealth Platform |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of the SEI Wealth Platform | 9 years 9 months 18 days |  |
Building and Building Improvements | Minimum |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of property and equipment | 25 years |  |
Building and Building Improvements | Maximum |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of property and equipment | 39 years |  |
Computer Equipment | Minimum |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of property and equipment | 3 years |  |
Computer Equipment | Maximum |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of property and equipment | 5 years |  |
SEI Sponsored Open Ended Money Market Mutual Funds |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Cash and cash equivalents | $ 305,434,000 | 290,256,000 |
SEI Investments Europe Limited |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Restricted cash | 250,000 | 250,000 |
SEI Investments Distribution Co |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Restricted cash | 101,000 | 101,000 |
SEI Sponsored Open Ended Money Market Mutual Funds |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Fees waived according to expense limitation agreements | $ 35,426,000 | $ 45,129,000 | $ 33,408,000

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