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Quarterly Results for 2023 and 2022 (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Direct premiums written, period increase (decrease) | $ 16,500 |  |  |  |
Direct premiums written, period increase (decrease) (percent) | 4.00% |  |  |  |
Direct premiums written | $ 432,600 |  | $ 1,921,833 | $ 1,845,786 | $ 1,671,252
Policies in force, period increase (decrease) | $ 2,379 |  | $ (38,924) |  |
Policies in force, increase (decrease) (percent) | 0.30% |  | (4.60%) |  |
Expense ratio, period increase (decrease) (percent) |  | 25.10% |  | 25.10% |
Minimum |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Expense ratio, period increase (decrease) (percent) | 21.80% |  | 21.80% |  |
FLORIDA |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Direct premiums written, period increase (decrease) | $ 2,000 |  |  |  |
Direct premiums written, period increase (decrease) (percent) | 0.60% |  |  |  |
States Other than Florida |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Direct premiums written, period increase (decrease) |  | $ 14,600 |  |  |
Direct premiums written, period increase (decrease) (percent) |  | 18.60% |  |  |

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- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479655/944-605-50-1 + Details
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- Details
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