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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
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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 |

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