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Commitments, Contingencies and Guarantees (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Put Obtains Upon Termination and Other $ 102,150    
Investment Commitments 3,370    
Letters of Credit Outstanding, Amount 4,999    
Estimated Payments for Purchase of Ownership Interest on Exercise of Put Options 17,029    
Estimated Issuance of Share Capital for Purchase of Ownership Interest on Exercise of Put Options 1,668    
Redeemable Noncontrolling Interest, Equity, Fair Value $ 119,177 $ 117,953 $ 107,432