Financial Assets and Liabilities at Fair Value (Detail) - USD ($) $ in Thousands		Dec. 31, 2016		Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Due to Affiliates	[1]	$ 7,748
Securities Sold, Not Yet Purchased		215,398	[1]	$ 176,667
Freestanding Derivatives, Liabilities	[1]	3,903
Total Liabilities of Consolidated Blackstone Funds	[1]	7,253		12,765
Total Blackstone's Treasury Cash Management Strategies				1,682,259
Other Investments		282,491		159,152
Total Investments		9,281,603		6,455,355
Net Investment Hedges - Foreign Currency Contracts				319
Total Other Assets		3,393		4,619
Total Financial Assets		9,939,797		7,182,201
Net Investment Hedges - Foreign Currency Contracts				1
Fair value of Notes		5,471,398		3,323,435
Total Accounts Payable, Accrued Expenses and Other Liabilities				21,507
Total Financial Liabilities		5,698,172		3,521,609
Cash and Cash Equivalents - Money Market Funds		443,442		460,233
Foreign Currency Contracts		28,443		6,019
Freestanding Derivatives, Liabilities		11,376		21,507
Investments of Consolidated Funds	[1]	6,480,674		4,613,944
Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts		28,443		5,700
Freestanding Derivatives, Liabilities		10,789		21,506
Loans and Receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and Receivables		211,359		261,994
Corporate Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Loans		4,762,071		3,087,563
Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds	[1]	148,993		155,512
Equity Securities	[1]	240,582		216,833
Partnership and LLC Interests	[1]	366,660		573,790
Debt Instruments	[1]	226,371		199,846
Investments Of Consolidated Blackstone Funds | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts	[1]	22,723		1,400
Investments Of Consolidated Blackstone Funds | Corporate Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Loans	[1]	4,762,071		3,087,563
Corporate Treasury Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities		281,505		240,464
Debt Instruments		2,029,502		1,240,229
Total Blackstone's Treasury Cash Management Strategies		2,518,438
Corporate Treasury Investments | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other		207,431		201,566
Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts		3,393		4,300
Freestanding Derivatives, Liabilities	[1]	3,536
Credit Default Swap | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1],[2]			8,231
Credit Default Swap | Investments Of Consolidated Blackstone Funds | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities		3,350		6,275
Credit Default Swap | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities		215		2,411
Foreign Currency Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]			6,490
Net Investment Hedges - Foreign Currency Contracts		587
Foreign Currency Contracts | Investments Of Consolidated Blackstone Funds | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts	[1]	2,327
Foreign Currency Contracts | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts		1,037		2,088
Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Bonds		710,947		379,000
Corporate Bonds | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Bonds	[1]	710,947		379,000
Interest Rate Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]			4,288
Interest Rate Contracts | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts		2,356		2,212
Senior Secured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1],[2]			3,225,064
Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Notes	[1],[2]	7,748
Freestanding Derivatives, Liabilities	[1],[2]			90,140
Liabilities of Consolidated Funds and CLO Vehicles
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Notes	[1]	5,463,650
Liabilities of Consolidated Funds and CLO Vehicles | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]			3,315,204
Liabilities of Consolidated Funds and CLO Vehicles | Credit Default Swap | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]	215
Liabilities of Consolidated Funds and CLO Vehicles | Foreign Currency Contracts | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]	966
Liabilities of Consolidated Funds and CLO Vehicles | Interest Rate Contracts | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]	2,355
Liabilities of Consolidated Funds and CLO Vehicles | Senior Secured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Notes	[1],[2]	5,125,804
Liabilities of Consolidated Funds and CLO Vehicles | Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Notes	[1],[2]	337,846
Accounts Payable Accrued Expenses and Other Liabilities Liabilities of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Accounts Payable, Accrued Expenses and Other Liabilities		11,376
Freestanding Derivatives, Liabilities	[1]			8,741
Accounts Payable Accrued Expenses and Other Liabilities Liabilities of Consolidated Blackstone Funds | Credit Default Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]			6,275
Accounts Payable Accrued Expenses and Other Liabilities Liabilities of Consolidated Blackstone Funds | Credit Default Swap | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]	3,350		2,411
Accounts Payable Accrued Expenses and Other Liabilities Liabilities of Consolidated Blackstone Funds | Foreign Currency Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]			2,042
Due to Affiliate Liabilities of Consolidated Funds and CLO Vehicles
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Due to Affiliates	[1]			8,231
Net Asset Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Blackstone's Treasury Cash Management Strategies				317,223
Other Investments		18,779		17,707
Total Investments		430,110		490,442
Total Financial Assets		430,110		490,442
Investments of Consolidated Funds	[1]	148,993		155,512
Net Asset Value | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds	[1]	148,993		155,512
Net Asset Value | Corporate Treasury Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instruments		54,907		115,657
Total Blackstone's Treasury Cash Management Strategies		262,338
Net Asset Value | Corporate Treasury Investments | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other		207,431		201,566
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Blackstone's Treasury Cash Management Strategies				240,464
Other Investments		163,548		40,261
Total Investments		521,434		363,459
Total Other Assets		1,883		1,806
Total Financial Assets		966,759		825,498
Total Accounts Payable, Accrued Expenses and Other Liabilities				835
Total Financial Liabilities		750		835
Cash and Cash Equivalents - Money Market Funds		443,442		460,233
Investments of Consolidated Funds	[1]	76,381		82,734
Level 1 | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities	[1]	76,381		82,734
Level 1 | Corporate Treasury Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities		281,505		240,464
Total Blackstone's Treasury Cash Management Strategies		281,505
Level 1 | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts		1,883		1,806
Freestanding Derivatives, Liabilities	[1]	750
Level 1 | Interest Rate Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]			835
Level 1 | Interest Rate Contracts | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts		1,883		1,806
Level 1 | Liabilities of Consolidated Funds and CLO Vehicles | Interest Rate Contracts | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]	750
Level 1 | Accounts Payable Accrued Expenses and Other Liabilities Liabilities of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Accounts Payable, Accrued Expenses and Other Liabilities		750
Freestanding Derivatives, Liabilities	[1]			835
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Due to Affiliates	[1]	7,748
Securities Sold, Not Yet Purchased		215,398	[1]	176,667
Freestanding Derivatives, Liabilities	[1]	3,903
Total Liabilities of Consolidated Blackstone Funds	[1]	7,253		12,765
Total Blackstone's Treasury Cash Management Strategies				1,069,915
Total Investments		7,513,598		4,671,221
Net Investment Hedges - Foreign Currency Contracts				319
Total Other Assets		1,510		2,813
Total Financial Assets		7,515,108		4,674,034
Net Investment Hedges - Foreign Currency Contracts				1
Total Accounts Payable, Accrued Expenses and Other Liabilities				20,672
Total Financial Liabilities		5,697,422		3,520,774
Investments of Consolidated Funds	[1]	5,569,427		3,601,306
Level 2 | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities	[1]	70,544		53,250
Partnership and LLC Interests	[1]	29,430		101,399
Debt Instruments	[1]	219,049		179,465
Level 2 | Investments Of Consolidated Blackstone Funds | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts	[1]	22,723		1,400
Level 2 | Investments Of Consolidated Blackstone Funds | Corporate Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Loans	[1]	4,514,407		2,886,792
Level 2 | Corporate Treasury Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instruments		1,944,171		1,069,915
Total Blackstone's Treasury Cash Management Strategies		1,944,171
Level 2 | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts		1,510		2,494
Freestanding Derivatives, Liabilities	[1]	2,786
Level 2 | Credit Default Swap | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1],[2]			8,231
Level 2 | Foreign Currency Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]			6,490
Net Investment Hedges - Foreign Currency Contracts		587
Level 2 | Foreign Currency Contracts | Investments Of Consolidated Blackstone Funds | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts	[1]	2,327
Level 2 | Foreign Currency Contracts | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts		1,037		2,088
Level 2 | Corporate Bonds | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Bonds	[1]	710,947		379,000
Level 2 | Interest Rate Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]			3,453
Level 2 | Interest Rate Contracts | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Contracts		473		406
Level 2 | Senior Secured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1],[2]			3,225,064
Level 2 | Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Notes	[1],[2]	7,748
Freestanding Derivatives, Liabilities	[1],[2]			90,140
Level 2 | Liabilities of Consolidated Funds and CLO Vehicles
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Notes	[1]	5,463,650
Level 2 | Liabilities of Consolidated Funds and CLO Vehicles | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]			3,315,204
Level 2 | Liabilities of Consolidated Funds and CLO Vehicles | Credit Default Swap | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]	215
Level 2 | Liabilities of Consolidated Funds and CLO Vehicles | Foreign Currency Contracts | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]	966
Level 2 | Liabilities of Consolidated Funds and CLO Vehicles | Interest Rate Contracts | Blackstone | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]	1,605
Level 2 | Liabilities of Consolidated Funds and CLO Vehicles | Senior Secured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Notes	[1],[2]	5,125,804
Level 2 | Liabilities of Consolidated Funds and CLO Vehicles | Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Notes	[1],[2]	337,846
Level 2 | Accounts Payable Accrued Expenses and Other Liabilities Liabilities of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Accounts Payable, Accrued Expenses and Other Liabilities		10,626
Freestanding Derivatives, Liabilities	[1]			7,906
Level 2 | Accounts Payable Accrued Expenses and Other Liabilities Liabilities of Consolidated Blackstone Funds | Credit Default Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]			6,275
Level 2 | Accounts Payable Accrued Expenses and Other Liabilities Liabilities of Consolidated Blackstone Funds | Credit Default Swap | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]	3,350		2,411
Level 2 | Accounts Payable Accrued Expenses and Other Liabilities Liabilities of Consolidated Blackstone Funds | Foreign Currency Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]			2,042
Level 2 | Due to Affiliate Liabilities of Consolidated Funds and CLO Vehicles
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Due to Affiliates	[1]			8,231
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Blackstone's Treasury Cash Management Strategies				54,657
Other Investments		100,164		101,184
Total Investments		816,461		930,233
Total Financial Assets		1,027,820		1,192,227
Total Financial Liabilities		0
Investments of Consolidated Funds	[1]	685,873		774,392
Level 3 | Loans and Receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and Receivables		211,359		261,994
Level 3 | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities	[1]	93,657		80,849
Partnership and LLC Interests	[1]	337,230		472,391
Debt Instruments	[1]	7,322		20,381
Level 3 | Investments Of Consolidated Blackstone Funds | Corporate Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Loans	[1]	247,664		200,771
Level 3 | Corporate Treasury Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instruments		30,424		$ 54,657
Total Blackstone's Treasury Cash Management Strategies		$ 30,424

[1] Pursuant to GAAP consolidation guidance, the Partnership is required to consolidate all VIEs in which it has been identified as the primary beneficiary, including certain CLO vehicles, and other funds in which a consolidated entity of the Partnership, as the general partner of the fund, has a controlling financial interest. While the Partnership is required to consolidate certain funds, including CLO vehicles, for GAAP purposes, the Partnership has no ability to utilize the assets of these funds and there is no recourse to the Partnership for their liabilities since these are client assets and liabilities.

[2] Senior and subordinate notes issued by CLO vehicles are classified based on the more observable fair value of CLO assets less (a) the fair value of any beneficial interests held by Blackstone, and (b) the carrying value of any beneficial interests that represent compensation for services.