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Realized and Net Change in Unrealized Gains (Losses) on Investments Held by Blackstone's Treasury Cash Management Strategies (Detail) (Blackstone's Treasury Cash Management Strategies, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Blackstone's Treasury Cash Management Strategies
       
Gain (Loss) on Investments [Line Items]        
Realized Gains (Losses) $ (6,587) $ 3,228 $ (4,030) $ 3,238
Net Change in Unrealized Gains (Losses) 10,126 6,525 (9,041) 7,351
Total realized and net change in unrealized gains (losses) $ 3,539 $ 9,753 $ (13,071) $ 10,589