Financial Assets and Liabilities at Fair Value (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Blackstone's Treasury Cash Management Strategies		$ 1,588,194	$ 1,682,259
Freestanding Derivatives, Assets		15,385	6,019
Money Market Funds		170,680	460,233
Investments of Consolidated Funds		4,885,584	4,613,944
Net Investment Hedges - Foreign Currency Contracts		9	319
Freestanding Derivatives, Liabilities		18,998	21,507
Other Investments		253,083	159,152
Total Financial Assets		7,189,222	7,182,201
Securities Sold, Not Yet Purchased		105,857	176,667
Total Financial Liabilities		3,678,874	3,521,609
Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets		15,376	5,700
Freestanding Derivatives, Liabilities		17,321	21,506
Loans and Receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and Receivables		287,858	261,994
Corporate Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Loans		3,363,794	3,087,563
Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds	[1]	149,071	155,512
Equity Securities	[1]	207,892	216,833
Partnership and LLC Interests	[1]	553,344	573,790
Debt Instruments	[1]	187,848	199,846
Investments of Consolidated Funds	[1]	4,885,584	4,613,944
Investments Of Consolidated Blackstone Funds | Corporate Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Loans	[1]	3,363,794	3,087,563
Blackstone's Treasury Cash Management Strategies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities		143,882	240,464
Debt Instruments		1,249,026	1,240,229
Other		195,286	201,566
Total Blackstone's Treasury Cash Management Strategies		1,588,194	1,682,259
Credit Default Swap | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets		12
Freestanding Derivatives, Liabilities			2,411
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		7,647	6,275
Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Bonds		412,073	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]	412,073	379,000
Foreign Currency Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Investment Hedges - Foreign Currency Contracts		9	319
Net Investment Hedges - Foreign Currency Contracts		1,677	1
Foreign Currency Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets		2,902	2,088
Freestanding Derivatives, Liabilities		1,063	2,042
Foreign Currency Contracts | Investments Of Consolidated Blackstone Funds | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets	[1]	11,562	1,400
Interest Rate Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets		900	2,212
Freestanding Derivatives, Liabilities		5,765	4,288
Liabilities of Consolidated Funds and CLO Vehicles | Credit Default Swap | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]	7,647	6,275
Liabilities of Consolidated Funds and CLO Vehicles | Foreign Currency Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]	2,846	6,490
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]	3,467,956	3,225,064
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]	86,063	98,371
Net Asset Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Investments		17,718	17,707
Total Financial Assets		478,619	490,442
Net Asset Value | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds	[1]	149,071	155,512
Investments of Consolidated Funds	[1]	149,071	155,512
Net Asset Value | Blackstone's Treasury Cash Management Strategies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instruments		116,544	115,657
Other		195,286	201,566
Total Blackstone's Treasury Cash Management Strategies		311,830	317,223
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds		170,680	460,233
Other Investments		135,956	40,261
Total Financial Assets		555,463	825,498
Total Financial Liabilities		1,899	835
Level 1 | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities	[1]	71,851	82,734
Partnership and LLC Interests	[1]	32,642
Investments of Consolidated Funds	[1]	104,493	82,734
Level 1 | Blackstone's Treasury Cash Management Strategies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities		143,882	240,464
Total Blackstone's Treasury Cash Management Strategies		143,882	240,464
Level 1 | Interest Rate Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets		452	1,806
Freestanding Derivatives, Liabilities		1,899	835
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Financial Assets		5,000,320	4,674,034
Securities Sold, Not Yet Purchased		105,857	176,667
Total Financial Liabilities		3,676,975	3,520,774
Level 2 | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities	[1]	53,317	53,250
Partnership and LLC Interests	[1]	75,005	101,399
Debt Instruments	[1]	168,597	179,465
Investments of Consolidated Funds	[1]	3,895,322	3,601,306
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]	3,174,768	2,886,792
Level 2 | Blackstone's Treasury Cash Management Strategies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instruments		1,101,627	1,069,915
Total Blackstone's Treasury Cash Management Strategies		1,101,627	1,069,915
Level 2 | Credit Default Swap | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets		12
Freestanding Derivatives, Liabilities			2,411
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]	412,073	379,000
Level 2 | Foreign Currency Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Investment Hedges - Foreign Currency Contracts		9	319
Net Investment Hedges - Foreign Currency Contracts		1,677	1
Level 2 | Foreign Currency Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets		2,902	2,088
Freestanding Derivatives, Liabilities		1,063	2,042
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]
Freestanding Derivatives, Assets	[1]	11,562	1,400
Level 2 | Interest Rate Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets		448	406
Freestanding Derivatives, Liabilities		3,866	3,453
Level 2 | Liabilities of Consolidated Funds and CLO Vehicles | Credit Default Swap | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]	7,647	6,275
Level 2 | Liabilities of Consolidated Funds and CLO Vehicles | Foreign Currency Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	[1]	2,846	6,490
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]	3,467,956	3,225,064
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]	86,063	98,371
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Investments		99,409	101,184
Total Financial Assets		1,154,820	1,192,227
Total Financial Liabilities		0
Level 3 | Loans and Receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and Receivables		287,858	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]	82,724	80,849
Partnership and LLC Interests	[1]	445,697	472,391
Debt Instruments	[1]	19,251	20,381
Investments of Consolidated Funds	[1]	736,698	774,392
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]	189,026	200,771
Level 3 | Blackstone's Treasury Cash Management Strategies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instruments		30,855	54,657
Total Blackstone's Treasury Cash Management Strategies		$ 30,855	$ 54,657

[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.