Reconciliation of Total Segments to Income (Loss) Before Provision for Taxes and Total Assets (Detail) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2018		Jun. 30, 2017		Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues		$ 2,632,570		$ 1,535,726		$ 4,401,701		$ 3,450,444
Expenses		1,016,381		881,193		1,999,312		1,802,966
Other Income		73,519		110,054		184,118		176,186
Economic Income / Income Before Provision for Taxes	[1]	1,689,708		764,587		2,586,507		1,823,664
Total Assets		30,075,297				30,075,297				$ 34,415,919
Operating Segments
Segment Reporting Information [Line Items]
Revenues		1,969,393		1,474,896		3,634,146		3,283,026
Expenses		864,873		755,069		1,719,689		1,576,484
Economic Income / Income Before Provision for Taxes	[1]	1,104,520		719,827		1,914,457		1,706,542
Total Assets		21,486,487				21,486,487
Consolidation Adjustments and Reconciling Items
Segment Reporting Information [Line Items]
Revenues		663,177		60,830		767,555		167,418
Expenses		151,508		126,124		279,623		226,482
Other Income		73,519		110,054		184,118		176,186
Economic Income / Income Before Provision for Taxes	[1]	585,188		44,760		672,050		117,122
Total Assets		8,588,810				8,588,810
Consolidation Adjustments and Reconciling Items | Impact of Consolidation Adjustment [Member]
Segment Reporting Information [Line Items]
Revenues	[2]	82,752		57,503		186,276		159,142
Expenses	[2]	26,288		53,622		86,187		80,708
Other Income	[2]	73,519		110,054		184,118		176,186
Economic Income / Income Before Provision for Taxes	[1],[2]	129,983		113,935		284,207		254,620
Total Assets	[2]	8,588,810				8,588,810
Consolidation Adjustments and Reconciling Items | Amortization of Intangibles Adjustment [Member]
Segment Reporting Information [Line Items]
Revenues	[3]	(387)		(387)		(774)		(774)
Expenses	[3]	14,486		10,957		28,972		21,914
Economic Income / Income Before Provision for Taxes	[1],[3]	(14,873)		(11,344)		(29,746)		(22,688)
Consolidation Adjustments and Reconciling Items | Intersubsegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues		(1,293)	[4]	(1,628)		(2,634)		(3,067)
Expenses		(1,293)	[4]	(1,628)		(2,634)		(3,067)
Consolidation Adjustments and Reconciling Items | Transaction Related Charges Adjustment [Member]
Segment Reporting Information [Line Items]
Revenues		582,105		5,342	[4]	584,687	[5]	12,117	[5]
Expenses		112,027		63,173	[4]	167,098	[5]	126,927	[5]
Economic Income / Income Before Provision for Taxes	[1]	$ 470,078		$ (57,831)	[4]	$ 417,589	[5]	$ (114,810)	[5]

[1] Represents Total Segments Economic Income reconciled to Blackstone Consolidated Income Before Provision for Taxes.

[2] The Impact of Consolidation adjustment represents the effect of consolidating Blackstone Funds, the elimination of Blackstone's interest in these funds, the increase to revenue representing the reimbursement of certain expenses by Blackstone Funds, which are presented gross under GAAP but netted against Other Operating Expenses in the segment presentation, and the removal of amounts associated with the ownership of Blackstone consolidated operating partnerships held by non-controlling interests.

[3] Amortization of intangibles consists of the amortization of transaction-related intangibles including intangibles associated with Blackstone's investment in Patria, which is accounted for under the equity method.

[4] Transaction-Related Charges arise from corporate actions including acquisitions, divestitures, and Blackstone's initial public offering. They consist primarily of equity-based compensation charges, gains and losses on contingent consideration arrangements, changes in the balance of the tax receivable agreement resulting from a change in tax law or similar event, transaction costs and any gains or losses associated with these corporate actions. During the three months ended June 30, 2018, Transaction-Related Charges include $580.9 million of Other Revenues received upon the conclusion of Blackstone's investment sub-advisory relationship with FS Investments' funds.

[5] Transaction-Related Charges arise from corporate actions including acquisitions, divestitures, and Blackstone's initial public offering. They consist primarily of equity-based compensation charges, gains and losses on contingent consideration arrangements, changes in the balance of the tax receivable agreement resulting from a change in tax law or similar event, transaction costs and any gains or losses associated with these corporate actions. During the six months ended June 30, 2018, Transaction-Related Charges include $580.9 million of Other Revenues received upon the conclusion of Blackstone's investment sub-advisory relationship with FS Investments' funds.