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Fair Value Measurements - Summary of Company's Fair Value Hierarchy for its Financial Assets and Liabilities (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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cash and cash equivalent [Member] | Private Equity Funds, US [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of cash equivalents | $ 14.6 | $ 23.5
Marketable investment [Member] | Private Equity Funds, Non-US [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of investments | $ 38.8 | $ 31.6

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