v3.22.2.2
Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Direct losses and loss adjustment expenses   $ 1,269,344 $ 264,068 $ 1,724,729 $ 777,668
Losses and loss adjustment expenses $ 45,000 330,444 187,581 715,854 498,765
Ceded losses and loss adjustment expenses 66,000 938,900 76,487 1,008,875 278,903
Incurred related to prior years   2,715 11,489 7,080 17,983
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   26,400 87,900 100,600 296,900
Ceded losses and loss adjustment expenses   23,700 76,400 93,500 278,900
Incurred related to prior years   $ 2,700 11,500 7,100 18,000
Hurricane          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Direct losses and loss adjustment expenses     81,700   282,900
Ceded losses and loss adjustment expenses     76,400   278,900
Incurred related to prior years     5,300   4,000
Hurricane Ian          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Direct losses and loss adjustment expenses 1,000,000        
Reinsurance tower 3,000,000        
Losses and loss adjustment expenses       111,000  
Ceded losses and loss adjustment expenses $ 66,000        
Hurricane Irma          
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Direct losses and loss adjustment expenses       76,200  
Ceded losses and loss adjustment expenses       69,200  
Incurred related to prior years       7,000  
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     $ 6,200   $ 14,000