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Organization (Details) (USD $)
 2 Months Ended 12 Months Ended
Feb. 29, 2012
Class
Dec. 31, 2013
Class
Dec. 31, 2012
Dec. 31, 2013
Class D [Member]
Dec. 31, 2012
Class D [Member]
Dec. 31, 2011
Class D [Member]
Dec. 31, 2010
Class D [Member]
Capital Unit [Line Items]              
Number of share classes 4 2          
Number of shares outstanding (in shares)       0 23.012 59.829 1,818.843
Cash   $ 0 $ 0