Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating Activities
Net Income	$ 1,713,535	$ 1,878,257
Blackstone Funds Related
Unrealized Appreciation on Investments Allocable to Non-Controlling Interests in Consolidated Entities	(28,903)	(290,698)
Net Realized Gains on Investments	(2,689,849)	(1,457,777)
Changes in Unrealized Losses on Investments Allocable to The Blackstone Group L.P.	53,219	45,811
Non-Cash Performance Fees	37,652	(930,489)
Non-Cash Performance Fee Compensation	619,256	655,092
Equity-Based Compensation Expense	482,683	381,553
Excess Tax Benefits Related to Equity-Based Compensation	(60,045)	(17,938)
Amortization of Intangibles	48,422	51,824
Other Non-Cash Amounts Included in Net Income	167,112	113,063
Cash Flows Due to Changes in Operating Assets and Liabilities
Cash Held by Blackstone Funds and Other	1,033,351	(106,245)
Cash Relinquished in Deconsolidation and Liquidation of Partnership	(442,370)	(293,989)
Accounts Receivable	28,916	280,586
Reverse Repurchase Agreements	(61,376)	118,263
Due from Affiliates	(85,616)	244,803
Other Assets	(87,332)	(30,289)
Accrued Compensation and Benefits	(577,607)	(340,604)
Securities Sold, Not Yet Purchased	56,906	(97,247)
Accounts Payable, Accrued Expenses and Other Liabilities	(444,242)	(440,090)
Repurchase Agreements	11,743	(313,675)
Due to Affiliates	(109,090)	3,672
Treasury Cash Management Strategies
Investments Purchased	(2,013,059)	(1,595,138)
Cash Proceeds from Sale of Investments	2,035,454	1,767,007
Blackstone Funds Related
Investments Purchased	(1,716,764)	(3,686,756)
Cash Proceeds from Sale or Pay Down of Investments	3,628,386	5,904,448
Net Cash Provided by Operating Activities	1,600,382	1,843,444
Investing Activities
Purchase of Furniture, Equipment and Leasehold Improvements	(16,539)	(13,618)
Changes in Restricted Cash	5,843	5,841
Net Cash Used in Investing Activities	(10,696)	(7,777)
Financing Activities
Distributions to Non-Controlling Interest Holders in Consolidated Entities	(421,088)	(449,914)
Contributions from Non-Controlling Interest Holders in Consolidated Entities	220,243	690,755
Purchase of Interests from Certain Non-Controlling Interest Holders		(6)
Payments Under Tax Receivable Agreement	(82,830)	(80,565)
Net Settlement of Vested Common Units and Repurchase of Common and Blackstone Holdings Partnership Units	(35,660)	(25,290)
Excess Tax Benefits Related to Equity-Based Compensation	60,045	17,938
Proceeds from Loans Payable	675,831	490,101
Repayment and Repurchase of Loans Payable	(2,652)	(7,934)
Distributions to Unitholders	(2,046,768)	(1,123,123)
Blackstone Funds Related
Proceeds from Loans Payable	888,535	42,197
Repayment of Loans Payable	(93,358)	(998,743)
Net Cash Used in Financing Activities	(837,702)	(1,444,584)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	184	(8)
Net Increase in Cash and Cash Equivalents	752,168	391,075
Cash and Cash Equivalents, Beginning of Period	1,412,472	831,998
Cash and Cash Equivalents, End of Period	2,164,640	1,223,073
Supplemental Disclosure of Cash Flows Information
Payments for Interest	62,691	49,580
Payments for Income Taxes	91,513	89,792
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Non-Cash Contributions from Non-Controlling Interest Holders	1,022	10,553
Non-Cash Distributions to Non-Controlling Interest Holders	(127)	(11,355)
Net Activities Related to Capital Transactions of Consolidated Blackstone Funds	(277)	5,239
Net Assets Related to the Consolidation of CLO Vehicles		8,398
Net Assets Related to the Consolidation of Certain Fund Entities		35,433
Notes Issuance Costs	5,269	4,375
Transfer of Interests to Non-Controlling Interest Holders	(18,299)	(3,014)
Change in The Blackstone Group L.P.'s Ownership Interest	67,809	(11,704)
Net Settlement of Vested Common Units	108,664	59,301
Conversion of Blackstone Holdings Partnership Units to Common Units	86,935	64,497
Acquisition of Ownership Interests from Non-Controlling Interest Holders
Deferred Tax Asset	(108,594)	(63,173)
Due to Affiliates	90,880	48,177
Partners' Capital	$ 17,714	$ 14,996