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Related Party Transactions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Related Party Transactions [Abstract]      
Accounts payable, related parties $ 0.1   $ 0.1
Distribution and administration expenses $ 0.2 $ 0.7