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Investments in Equity Method Affiliates - Schedule of Investment in Equity Method Affiliates (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Investments In Equity Method Affiliates [Line Items]    
Carrying value of equity method investment reclassified to other investments, at fair value $ 39,192 $ 37,299
Star Asia Opportunity II [Member]
    
Schedule Of Investments In Equity Method Affiliates [Line Items]    
Carrying value of equity method investment reclassified to other investments, at fair value $ 1,841