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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Direct losses and loss adjustment expenses | $ 260,230 | $ 276,302 | $ 455,385 | $ 513,600
Ceded losses and loss adjustment expenses | 59,926 | 109,081 | 69,975 | 202,416
Incurred related to prior years | 3,710 | 7,731 | 4,365 | 6,494
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 | 63,600 | 116,900 | 74,300 | 209,000
Ceded losses and loss adjustment expenses | 59,900 | 109,200 | 69,900 | 202,500
Incurred related to prior years | 3,700 | 7,700 | 4,400 | 6,500
Hurricane |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Direct losses and loss adjustment expenses |  | 109,100 |  | 201,200
Ceded losses and loss adjustment expenses |  | 109,200 |  | 202,500
Incurred related to prior years |  | (100) |  | (1,300)
Hurricane Irma |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Direct losses and loss adjustment expenses | 39,300 |  | 49,800 |
Ceded losses and loss adjustment expenses | 35,600 |  | 45,600 |
Incurred related to prior years | $ 3,700 |  | 4,200 |
Hurricane Matthew |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred related to prior years |  |  | $ 100 |
Settlement on Litigated Claims |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Incurred related to prior years |  | $ 7,800 |  | $ 7,800

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