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Summary of Impairments and Expense Related to Sale of Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Acquisition costs and other underwriting expenses | $ 35,968 | $ 47,101 | $ 74,237 | $ 100,579
Corporate and other operating expenses | $ 6,366 | $ 4,990 | $ 12,739 | $ 11,358

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