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Summary of Impairments and Expense Related to Sale of Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisition costs and other underwriting expenses	$ 46,202	$ 60,876	$ 146,781	$ 178,666
Corporate and other operating expenses	$ 5,280	14,064	$ 16,638	21,718
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		1,034		1,034
Corporate and other operating expenses		8,142		8,142
Total impairments and expenses related to sale		$ 9,176		$ 9,176