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Liability for Unpaid Losses and Loss Adjustment Expenses - Narrative (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2021 | Jul. 01, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Direct losses and loss adjustment expenses |  |  | $ 264,068 | $ 347,207 | $ 777,668 | $ 682,896
Incurred related to prior years |  |  | 11,489 | 30,085 | 17,983 | 34,904
Ceded losses and loss adjustment expenses |  |  | 76,487 | 108,730 | 278,903 | 158,026
Term of notice | 2 years | 3 years |  |  |  |
Adverse Prior Years' Reserve Development |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Direct losses and loss adjustment expenses |  |  | 87,900 |  | 296,900 |
Incurred related to prior years |  |  | 11,500 |  | 18,000 |
Ceded losses and loss adjustment expenses |  |  | 76,400 |  | 278,900 |
Hurricane |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Direct losses and loss adjustment expenses |  |  | 81,700 | 136,700 | 282,900 | 190,800
Incurred related to prior years |  |  | 5,300 | 30,100 | 4,000 | 34,900
Ceded losses and loss adjustment expenses |  |  | 76,400 | $ 106,700 | 278,900 | $ 155,900
Settlement on Litigated Claims |  |  |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Incurred related to prior years |  |  | $ 6,200 |  | $ 14,000 |

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