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Related Party - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 2 Months Ended
Feb. 29, 2012
Feb. 28, 2012
Statement Of Partners Capital [Abstract]    
Public offering common stock shares 3,597,333  
Non-voting common stock repurchased 1,821,730  
Revenue generated by related party   $ 1.6