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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 124,385 $ 114,673    
Reinsurance recoverable on unpaid losses and LAE 106 13,540 $ 47,350 $ 68,584
Reinsurance recoverable (payable) on paid losses (1,532) 9,313    
Reinsurance receivable, net 186 353    
Reinsurance recoverable (payable) and receivable $ (1,240) $ 23,206