Reconciliation of Realized and Net Change in Unrealized Gains (Losses) to Other Income - Net Gains from Fund Investment Activities in Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Gain (Loss) on Investments [Line Items]
Realized Gains	$ 60,473	$ 20,226	$ 127,512	$ 33,939
Net Change in Unrealized Gains (Losses)	(2,190)	68,333	1,743	41,119
Realized and Net Change in Unrealized Gains from Consolidated Blackstone Funds	58,283	88,559	129,255	75,058
Interest and Dividend Revenue Attributable to Consolidated Blackstone Funds	23,732	50,026	46,315	133,682
Other Income - Net Gains from Fund Investment Activities	$ 82,015	$ 138,585	$ 175,570	$ 208,740