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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Related Party Transactions [Abstract]      
Fees payable to Smith, Gambrell & Russell $ 0.2 $ 0.2  
Amount due to Smith, Gambrell & Russell $ 0.0   $ 0.1