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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Direct losses and loss adjustment expenses $ 208,222 $ 195,155
Ceded losses and loss adjustment expenses 2,068 10,049
Incurred related to prior years 3,318 655
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 5,400 10,700
Ceded losses and loss adjustment expenses 2,100 10,000
Incurred related to prior years $ 3,300 $ 700