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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

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