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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Direct losses and loss adjustment expenses $ 347,207 $ 334,440 $ 682,896 $ 663,768
Ceded losses and loss adjustment expenses 108,730 201,869 158,026 304,807
Incurred (recovered) related to prior years 30,085 $ 3,218 $ 34,904 3,703
Term of notice     3 years  
Hurricane        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Direct losses and loss adjustment expenses 136,700   $ 190,800 305,300
Ceded losses and loss adjustment expenses 106,700   155,900 301,600
Incurred (recovered) related to prior years $ 30,100   $ 34,900 $ 3,700