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Composition of Certain Financial Statement Captions - Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Items Included in Consolidated Statement of Financial Condition [Abstract] |  |  |
Accrued employee compensation | $ 129,228 | $ 107,495 |
Accrued employee benefits and other personnel | 8,557 | 9,797 |
Accrued voluntary separation program | 2,536 | 21,058 |
Accrued consulting, outsourcing and professional fees | 32,082 | 32,285 |
Accrued sub-advisory, distribution and other asset management fees | 53,727 | 49,405 |
Accrued dividend payable | 63,877 | 61,104 | $ 58,051
Other accrued liabilities | 57,506 | 37,801 |
Accrued liabilities | $ 347,513 | $ 318,945 |

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