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Marketable Securities
 9 Months Ended
Sep. 30, 2022
Marketable Securities [Abstract]  
Marketable Securities Marketable SecuritiesMarketable 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 $474,736 and $422,838 at September 30, 2022 and December 31, 2021, respectively. There were no material unrealized or realized gains or losses from these investments during the nine months ended September 30, 2022 and 2021. 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 September 30, 2022
 Cost
Amount		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair
Value
Available-for-sale debt securities$113,155 $— $(13,919)$99,236 
SEI-sponsored mutual funds6,197 — (745)5,452 
Equities and other mutual funds5,030 — (343)4,687 
$124,382 $— $(15,007)$109,375 
 At December 31, 2021
 Cost
Amount		Gross
Unrealized
Gains		Gross
Unrealized
(Losses)		Fair
Value
Available-for-sale debt securities$117,215 $— $(80)$117,135 
SEI-sponsored mutual funds6,748 463 — 7,211 
Equities and other mutual funds4,935 260 — 5,195 
$128,898 $723 $(80)$129,541 
Net unrealized losses at September 30, 2022 of available-for-sale debt securities were $10,718 (net of income tax benefit of $3,201). Net unrealized losses at December 31, 2021 of available-for-sale debt securities were $62 (net of income tax benefit of $18). 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 more likely than not 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 $521 and $861 from available-for-sale debt securities during the nine months ended September 30, 2022 and 2021, respectively. There were no gross realized gains from available-for-sale debt securities during the nine months ended September 30, 2022 and 2021. Realized losses from available-for-sale debt securities, including amounts reclassified from accumulated comprehensive loss, are reflected in Net (loss) gain from investments on the accompanying Consolidated Statements of Operations.
There were gross realized gains of $226 and gross realized losses of $714 from mutual funds and equities during the nine months ended September 30, 2022. There were gross realized gains of $714 and gross realized losses of $65 from mutual funds and equities during the nine months ended September 30, 2021. Gains and losses from mutual funds and equities are reflected in Net (loss) gain 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 (loss) gain from investments on the accompanying Consolidated Statements of Operations.
The funds had a fair value of $5,620 and $6,916 at September 30, 2022 and December 31, 2021, respectively. The Company recognized unrealized losses of $380 and $39 during the three months ended September 30, 2022 and 2021, respectively, from the change in fair value of the funds. The Company recognized unrealized losses of $1,296 and unrealized gains of $727 during the nine months ended September 30, 2022 and 2021, 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 $31,586 and $28,267 at September 30, 2022 and December 31, 2021, respectively. There were no material net gains or losses related to the securities during the three and nine months ended September 30, 2022 and 2021.