Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Investments of Consolidated Blackstone Funds	$ 4,885,584	$ 4,613,944
Equity Method Investments	3,116,125	3,110,810
Blackstone's Treasury Cash Management Strategies	1,588,194	1,682,259
Performance Fees	4,782,046	4,757,932
Other Investments	253,083	159,152
Investments	$ 14,625,032	$ 14,324,097