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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable and Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Reinsurance Disclosures [Abstract]            
Prepaid reinsurance premiums $ 110,739   $ 190,505      
Reinsurance recoverable on unpaid losses and LAE 31,777 $ 42,713 47,350 $ 58,705 $ 64,109 $ 68,584
Reinsurance recoverable on paid losses 6,380   7,837      
Reinsurance receivable, net 716   7,468      
Reinsurance recoverable and receivable $ 38,873   $ 62,655