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Related Party Transactions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Related Party Transactions [Abstract]      
Fees from Smith, Gambrell & Russell $ 0.8 $ 0.9  
Amount due to Smith, Gambrell & Russell $ 0.5   $ 0.2