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Liability for Unpaid Losses and Loss Adjustment Expenses - Change in Liability for Unpaid Losses and LAE (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Insurance [Abstract]      
Balance at beginning of year $ 472,829 $ 248,425 $ 58,494
Less: Reinsurance recoverable (393,365) (182,405) (106)
Net balance at beginning of period 79,464 66,020 58,388
Incurred (recovered) related to current year 515,338 314,933 322,929
Incurred (recovered) related to prior years 88,068 99,522 27,499
Total incurred 603,406 414,455 350,428
Paid related to Current year 391,161 221,708 215,274
Paid related to Prior years 147,170 179,303 127,522
Total paid 538,331 401,011 342,796
Net balance at end of period 144,539 79,464 66,020
Plus: Reinsurance recoverable 123,221 393,365 182,405
Balance at end of year $ 267,760 $ 472,829 $ 248,425