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Related Party Transactions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Related Party Transactions [Abstract]    
Fees payable to Smith, Gambrell & Russell $ 0.2us-gaap_ProfessionalFees $ 0.1us-gaap_ProfessionalFees
Amount due to Smith, Gambrell & Russell $ 0.1us-gaap_DueToRelatedPartiesCurrentAndNoncurrent $ 0.1us-gaap_DueToRelatedPartiesCurrentAndNoncurrent