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Market and Credit Risk - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Concentration Risk [Line Items]    
Number of limited partners 1,000  
Total committed capital by individual investor no more than 10.00%  
Variable Interest Rate [Member]
    
Concentration Risk [Line Items]    
Debt balance $ 728.3 $ 737.8