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Loss Reserves - Change in Allowance for Credit Losses on Amounts Recoverable from Reinsurers (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Insurance [Abstract]        
Balance, beginning of period $ 452 $ 449 $ 452 $ 444
Provision for credit loss benefit (3) (61) (3) (56)
Balance, end of period $ 449 $ 388 $ 449 $ 388