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Related Party Transactions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Related Party Transactions [Abstract]    
Fees payable to Smith, Gambrell & Russell $ 0.1 $ 0.8
Amount due to Smith, Gambrell & Russell $ 0 $ 0