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Liability for Unpaid Losses and Loss Adjustment Expenses - Reconciliation of Net Incurred and Paid Claims Development Tables to Liability for Unpaid Losses and LAE (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Insurance [Abstract]        
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance $ 55,542      
Reinsurance recoverable on unpaid losses and LAE 182,405 $ 106 $ 13,540 $ 47,350
Unallocated claims adjustment expenses and other 10,478      
Total gross liability for unpaid claims and claim adjustment expense $ 248,425 $ 58,494 $ 98,840 $ 134,353