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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value Of Certain Financial Assets And Liabilities | The fair value of certain financial assets and liabilities of the Company and consolidated VIEs was determined using the following inputs:
|  | At September 30, 2025
|  | Level 1 |  | Level 2 |  | Level 3 |  | NAV as a Practical Expedient |  | Total
Financial Assets |  |  |  |  |  |  |  |  |  |
SEI Investments Company |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 53,494 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 53,494 |
Available-for-sale debt securities |  | — |  |  | 167,821 |  |  | — |  |  | — |  |  | 167,821 |
Securities owned |  | — |  |  | 31,242 |  |  | — |  |  | — |  |  | 31,242 |
Investment funds sponsored by LSV |  | — |  |  | — |  |  | — |  |  | 10,522 |  |  | 10,522 |
Investments in limited partnership funds |  | — |  |  | — |  |  | — |  |  | 865 |  |  | 865 |
Total financial assets of SEI Investments Company |  | 53,494 |  |  | 199,063 |  |  | — |  |  | 11,387 |  |  | 263,944 |
Consolidated VIEs |  |  |  |  |  |  |  |  |  |
Equity securities |  | 106,044 |  |  | — |  |  | — |  |  | — |  |  | 106,044 |
Total financial assets of consolidated VIEs |  | 106,044 |  |  | — |  |  | — |  |  | — |  |  | 106,044 |
Total financial assets measured at fair value |  | $ | 159,538 |  |  | $ | 199,063 |  |  | $ | — |  |  | $ | 11,387 |  |  | $ | 369,988 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |
SEI Investments Company |  |  |  |  |  |  |  |  |  |
Contingent considerations |  | $ | — |  |  | $ | — |  |  | $ | 9,252 |  |  | $ | — |  |  | $ | 9,252 |
Total financial liabilities of SEI Investments Company |  | — |  |  | — |  |  | 9,252 |  |  | — |  |  | 9,252 |
Consolidated VIEs |  |  |  |  |  |  |  |  |  |
Securities sold short |  | 100,466 |  |  | — |  |  | — |  |  | — |  |  | 100,466 |
Total financial liabilities of consolidated VIEs |  | 100,466 |  |  | — |  |  | — |  |  | — |  |  | 100,466 |
Total financial liabilities measured at fair value |  | $ | 100,466 |  |  | $ | — |  |  | $ | 9,252 |  |  | $ | — |  |  | $ | 109,718 |
|  | At December 31, 2024
|  | Level 1 |  | Level 2 |  | Level 3 |  | NAV as a Practical Expedient |  | Total
Financial Assets |  |  |  |  |  |  |  |  |  |
SEI Investments Company |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 40,530 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 40,530 |
Available-for-sale debt securities |  | — |  |  | 143,126 |  |  | — |  |  | — |  |  | 143,126 |
Securities owned |  | — |  |  | 29,583 |  |  | — |  |  | — |  |  | 29,583 |
Investment funds sponsored by LSV |  | — |  |  | — |  |  | — |  |  | 8,129 |  |  | 8,129 |
Total financial assets measured at fair value |  | $ | 40,530 |  |  | $ | 172,709 |  |  | $ | — |  |  | $ | 8,129 |  |  | $ | 221,368 |
Financial Liabilities |  |  |  |  |  |  |  |  |  |
SEI Investments Company |  |  |  |  |  |  |  |  |  |
Contingent considerations |  | $ | — |  |  | $ | — |  |  | $ | 14,355 |  |  | $ | — |  |  | $ | 14,355 |
Total financial liabilities measured at fair value |  | $ | — |  |  | $ | — |  |  | $ | 14,355 |  |  | $ | — |  |  | $ | 14,355 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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