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Related Party Transactions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Aug. 18, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2009
Investment Management And Other Fees And Related Party Transactions [Line Items]        
Percentage of outstanding shares of Series B   100.00%    
Accounts payable, related parties   $ 0.1 $ 0.2 $ 0.4
Accounts payable, related parties $ 0.8