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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, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisition costs and other underwriting expenses	$ 236,381	$ 222,841	$ 215,607
Corporate and other operating expenses	24,421	27,179	41,998
Renewal Rights Related to Manufactured and Dwelling Homes Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisition costs and other underwriting expenses	644	0	0
Corporate and other operating expenses	0	7,202	0
Total impairments and expenses related to sale	644	7,202	0
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	1,034	0	0
Corporate and other operating expenses	8,142	0	0
Total impairments and expenses related to sale	$ 9,176	$ 0	$ 0