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Investment fund (Details Textual) (Feeder Fund [Member], USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Net Asset Value $ 105.9 $ 120.4
Investment Owned In Percentage For Shares Issued 97.95% 98.03%
Common Stock, Shares, Issued 79,335.7 93,094.3
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Description "Class A", "Class A1" and "Class E" shares can be redeemed monthly by investors with 30 days' notice  
Common Class A [Member]
    
Common Stock, Shares, Issued 839.0 2,948.0
Common Class A1 [Member]
    
Common Stock, Shares, Issued 846.4 397.9
Common Class B [Member]
    
Common Stock, Shares, Issued 77,650.3 89,040.3
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount $ 100  
Common Class E1 [Member]
    
Common Stock, Shares, Issued   708.1