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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Direct losses and loss adjustment expenses $ 195,155 $ 237,298
Ceded losses and loss adjustment expenses 10,049 93,335
Incurred related to prior years 655 (1,237)
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 10,700  
Ceded losses and loss adjustment expenses 10,000  
Incurred related to prior years 700  
Hurricane    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Direct losses and loss adjustment expenses 10,700 92,100
Ceded losses and loss adjustment expenses 10,000 93,300
Incurred related to prior years $ 700 $ (1,200)