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Fair Value Disclosures - Schedule of Additional Information about Assets and Liabilities Measured at Fair Value on Recurring Basis Level 3 Inputs (Parenthetical) (Detail) (Star Asia Special Situations Fund [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Star Asia Special Situations Fund [Member]
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Purchase of Star Asia Special Situations Fund $ 1,841