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Premiums Receivable - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Premiums Receivable, Net [Abstract]      
Earned but Unbilled $ 5.2us-gaap_UnbilledContractsReceivable $ 4.3us-gaap_UnbilledContractsReceivable $ 3.0us-gaap_UnbilledContractsReceivable