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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