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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Prior year reserve development, ceded $ 30,408 $ 38,372 $ 121,441 $ 146,998        
Prior year reserve development, net 56,029 30,724 56,029 30,724 $ 91,179 $ 79,464 $ 55,183 $ 66,020
Hurricane                
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                
Prior year reserve development, gross 305,300 311,700 305,300 311,700        
Prior year reserve development, ceded     301,600 309,500        
Prior year reserve development, net $ 3,700 $ 2,200 $ 3,700 $ 2,200