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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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Blackstone's Treasury Cash Management Strategies
       
Gain (Loss) on Investments [Line Items]        
Realized Gains $ 2,167 $ 1,321 $ 10 $ 1,020
Net Change in Unrealized Gains (Losses) 5,245 1,592 826 2,221
Total realized and net change in unrealized gains (losses) $ 7,412 $ 2,913 $ 836 $ 3,241