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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Reinsurance Disclosures [Abstract]        
Prepaid reinsurance premiums $ 119,927 $ 114,673    
Reinsurance recoverable on unpaid losses and LAE 7,709 13,540 $ 42,713 $ 47,350
Reinsurance recoverable on paid losses 9,453 9,313    
Reinsurance receivable, net 186 353    
Reinsurance recoverable and receivable $ 17,348 $ 23,206