Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Related Party Transaction [Line Items]
Founder's, other senior managing directors' and employees' investments	$ 732,100		$ 746,300
Founder's, other senior managing directors' and employees' share of the Net Income (Loss) Attributable to Redeemable Non-Controlling Interests	3,000	$ 49,500
Management and Advisory Fees, Net from Affiliates	56,675	48,112
Interest from loans to affiliates	$ 200	$ 2,000
Partnership Unit to Blackstone Common Unit ratio	100.00%
Cash saving in tax receivable agreements, percentage	85.00%
Expected future payments under the tax receivable agreements	$ 1,100,000
Expected future payments under the tax receivable agreements in years	15 years
After-tax net present value estimated payments	$ 360,800
After-tax net present value discount rate assumption	15.00%