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Summary of Impairments and Expense Related to Sale of Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisition costs and other underwriting expenses	$ 147,345	$ 182,617	$ 236,381
Corporate and other operating expenses	25,696	23,383	24,421
Renewal Rights Related to Farm Ranch and Stable Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisition costs and other underwriting expenses	0	0	1,034
Corporate and other operating expenses	0	0	8,142
Total impairments and expenses related to sale	$ 0	$ 0	$ 9,176