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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

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