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Liability for Unpaid Losses and Loss Adjustment Expenses - Narrative (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Direct losses and loss adjustment expenses $ 237,298 $ 173,243
Ceded losses and loss adjustment expenses 93,335 38,195
Incurred related to prior years (1,237) 4,341
Hurricane    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Direct losses and loss adjustment expenses 92,100 42,500
Ceded losses and loss adjustment expenses 93,300 38,200
Incurred related to prior years $ (1,200) $ 4,300