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	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Blackstone's Treasury Cash Management Strategies
Gain (Loss) on Investments [Line Items]
Realized Gains (Losses)	$ (5,793)	$ 9,095	$ 9,738
Net Change in Unrealized Gains (Losses)	(9,342)	(502)	641
Total realized and net change in unrealized gains (losses)	$ (15,135)	$ 8,593	$ 10,379