Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities
Net Income	$ 842,304	$ 1,001,640
Adjustments to Reconcile Net Income to Net Cash Provided by (Used in) Operating Activities Blackstone Funds Related
Net Realized Gains on Investments	(306,440)	(1,464,126)
Changes in Unrealized Gains on Investments	(209,015)	63,480
Non-Cash Performance Allocations	(628,089)	129,872
Non-Cash Performance Allocations and Incentive Fee Compensation	373,159	396,476
Equity-Based Compensation Expense	92,223	91,269
Amortization of Intangibles	14,492	10,964
Other Non-Cash Amounts Included in Net Income	86,332	53,161
Cash Flows Due to Changes in Operating Assets and Liabilities
Cash Acquired with Consolidation of Fund Entity	31,422
Cash Relinquished with Deconsolidation of Fund Entities	(899,959)
Accounts Receivable	132,711	352,788
Reverse Repurchase Agreements		73,860
Due from Affiliates	(186,713)	(146,750)
Other Assets	(5,918)	2,335
Accrued Compensation and Benefits	(403,634)	(523,779)
Securities Sold, Not Yet Purchased	16,003	(37,632)
Accounts Payable, Accrued Expenses and Other Liabilities	(391,003)	(657,002)
Repurchase Agreements	23,678	19,415
Due to Affiliates	11,469	(65,935)
Investments Purchased	(5,007,608)	(2,330,873)
Cash Proceeds from Sale of Investments	4,644,753	3,583,318
Net Cash Provided by (Used in) Operating Activities	(1,769,833)	552,481
Investing Activities
Purchase of Furniture, Equipment and Leasehold Improvements	(4,686)	(10,007)
Net Cash Used in Investing Activities	(4,686)	(10,007)
Financing Activities
Distributions to Non-Controlling Interest Holders in Consolidated Entities	(123,422)	(139,059)
Contributions from Non-Controlling Interest Holders in Consolidated Entities	221,578	246,274
Payments Under Tax Receivable Agreement		(59,667)
Net Settlement of Vested Common Units and Repurchase of Common and Blackstone Holdings Partnership Units	(12,351)	(12,730)
Proceeds from Loans Payable	2,248,376	996,892
Repayment and Repurchase of Loans Payable	(1,004,660)	(125,425)
Distributions to Unitholders	(1,062,729)	(593,561)
Net Cash Provided by Financing Activities	266,792	312,724
Effect of Exchange Rate Changes on Cash and Cash Equivalents, Cash Held by Blackstone Funds and Other, and Restricted Cash	21,368	15,954
Cash and Cash Equivalents, Cash Held by Blackstone Funds and Other, and Restricted Cash
Net Increase (Decrease)	(1,486,359)	871,152
Beginning of Period	3,936,489	2,860,955
End of Period	2,450,130	3,732,107
Supplemental Disclosure of Cash Flows Information
Payments for Interest	41,764	57,339
Payments for Income Taxes	20,201	16,849
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Non-Cash Contributions from Non-Controlling Interest Holders		1,738
Non-Cash Distributions to Non-Controlling Interest Holders		(27,976)
Transfer of Interests to Non-Controlling Interest Holders	22,989	(2,062)
Change in The Blackstone Group L.P.'s Ownership Interest	(6,124)	(10,789)
Net Settlement of Vested Common Units	98,870	60,853
Conversion of Blackstone Holdings Units to Common Units	23,661	13,522
Acquisition of Ownership Interests from Non-Controlling Interest Holders Deferred Tax Asset	(23,818)	(15,129)
Due to Affiliates	20,298	12,832
Partners' Capital	3,520	$ 2,297
Issuance of Common Units	$ 24,970