Financial Data of Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total Management and Advisory Fees, Net	$ 603,498us-gaap_InvestmentAdvisoryFees	$ 573,160us-gaap_InvestmentAdvisoryFees
Performance Fees Realized - Carried Interest	1,206,425	333,623
Performance Fees Realized - Incentive Fees	27,992bx_PerformanceFeesRealizedIncentiveFees	43,794bx_PerformanceFeesRealizedIncentiveFees
Performance Fees Unrealized - Carried Interest	374,481	330,394
Performance Fees Unrealized - Incentive Fees	61,860	64,233
Total Performance Fees	1,670,758us-gaap_PerformanceFees	772,044us-gaap_PerformanceFees
Investment Income (Loss), Realized	187,710bx_InvestmentIncomeLossRealized	153,026bx_InvestmentIncomeLossRealized
Investment Income (Loss), Unrealized	15,771bx_InvestmentIncomeLossUnrealized	13,500bx_InvestmentIncomeLossUnrealized
Total Investment Income	203,481us-gaap_GainLossOnInvestments	166,526us-gaap_GainLossOnInvestments
Interest and Dividend Revenue	21,499	14,069
Other	(5,656)us-gaap_OtherIncome	869us-gaap_OtherIncome
Total Revenues	2,493,580us-gaap_Revenues	1,526,668us-gaap_Revenues
Compensation and Benefits Compensation	559,559us-gaap_SalariesAndWages	485,351us-gaap_SalariesAndWages
Performance Fee Compensation - Realized Carried Interest	292,248	149,398
Performance Fee Compensation - Realized Incentive Fees	12,227	23,635
Performance Fee Compensation - Unrealized Carried Interest	74,380	40,730
Performance Fee Compensation - Unrealized Incentive Fees	24,961	23,531
Total Compensation and Benefits	963,375us-gaap_LaborAndRelatedExpense	722,645us-gaap_LaborAndRelatedExpense
Total Expenses	1,148,950us-gaap_CostsAndExpenses	887,851us-gaap_CostsAndExpenses
Economic Income (Loss)	1,583,602	708,972
Segment Assets	32,406,601us-gaap_Assets	30,028,545us-gaap_Assets	31,510,894us-gaap_Assets
Operating Segments
Segment Reporting Information [Line Items]
Management and Advisory Fees, Base Management Fees	516,397	476,878
Management and Advisory Fees, Advisory Fees	84,238	69,963
Management and Advisory Fees, Transaction and Other Fees, Net	37,073	59,910
Management and Advisory Fees, Management Fee Offsets	(17,945)	(16,644)
Total Management and Advisory Fees, Net	619,763	590,107
Performance Fees Realized - Carried Interest	1,207,594	333,623
Performance Fees Realized - Incentive Fees	29,670	53,837
Performance Fees Unrealized - Carried Interest	373,852	330,288
Performance Fees Unrealized - Incentive Fees	62,620	61,266
Total Performance Fees	1,673,736	779,014
Investment Income (Loss), Realized	107,792	111,917
Investment Income (Loss), Unrealized	81,849	4,550
Total Investment Income	189,641	116,467
Interest and Dividend Revenue	30,451	22,362
Other	(4,872)	869
Total Revenues	2,508,719	1,508,819
Compensation and Benefits Compensation	329,838	306,545
Performance Fee Compensation - Realized Carried Interest	292,248	149,398
Performance Fee Compensation - Realized Incentive Fees	12,227	23,635
Performance Fee Compensation - Unrealized Carried Interest	74,380	40,690
Performance Fee Compensation - Unrealized Incentive Fees	24,961	23,531
Total Compensation and Benefits	733,654	543,799
Other Operating Expenses	143,282	139,774
Total Expenses	876,936	683,573
Economic Income (Loss)	1,631,783	825,246
Segment Assets	19,638,712	16,458,341
Operating Segments \| Private Equity Segment
Segment Reporting Information [Line Items]
Management and Advisory Fees, Base Management Fees	108,383	98,584
Management and Advisory Fees, Transaction and Other Fees, Net	20,359	42,847
Management and Advisory Fees, Management Fee Offsets	(4,949)	(1,713)
Total Management and Advisory Fees, Net	123,793	139,718
Performance Fees Realized - Carried Interest	382,978	119,805
Performance Fees Unrealized - Carried Interest	566,822	167,065
Total Performance Fees	949,800	286,870
Investment Income (Loss), Realized	44,816	60,535
Investment Income (Loss), Unrealized	31,487	(9,033)
Total Investment Income	76,303	51,502
Interest and Dividend Revenue	7,617	5,228
Other	(1,825)	864
Total Revenues	1,155,688	484,182
Compensation and Benefits Compensation	70,089	73,307
Performance Fee Compensation - Realized Carried Interest	39,482	85,771
Performance Fee Compensation - Unrealized Carried Interest	178,120	(27,148)
Total Compensation and Benefits	287,691	131,930
Other Operating Expenses	38,755	33,006
Total Expenses	326,446	164,936
Economic Income (Loss)	829,242	319,246
Segment Assets	6,754,805
Operating Segments \| Real Estate Segment
Segment Reporting Information [Line Items]
Management and Advisory Fees, Base Management Fees	152,348	159,336
Management and Advisory Fees, Transaction and Other Fees, Net	15,216	13,564
Management and Advisory Fees, Management Fee Offsets	(4,866)	(9,224)
Total Management and Advisory Fees, Net	162,698	163,676
Performance Fees Realized - Carried Interest	811,249	194,658
Performance Fees Realized - Incentive Fees	723	(26)
Performance Fees Unrealized - Carried Interest	(181,019)	140,237
Performance Fees Unrealized - Incentive Fees	6,069	2,737
Total Performance Fees	637,022	337,606
Investment Income (Loss), Realized	71,344	31,357
Investment Income (Loss), Unrealized	37,510	5,379
Total Investment Income	108,854	36,736
Interest and Dividend Revenue	9,997	6,110
Other	(3,977)	317
Total Revenues	914,594	544,445
Compensation and Benefits Compensation	84,834	80,233
Performance Fee Compensation - Realized Carried Interest	246,496	51,833
Performance Fee Compensation - Realized Incentive Fees	356	(16)
Performance Fee Compensation - Unrealized Carried Interest	(98,084)	56,985
Performance Fee Compensation - Unrealized Incentive Fees	2,575	1,382
Total Compensation and Benefits	236,177	190,417
Other Operating Expenses	40,143	33,107
Total Expenses	276,320	223,524
Economic Income (Loss)	638,274	320,921
Segment Assets	7,916,836
Operating Segments \| Hedge Fund Solutions Segment
Segment Reporting Information [Line Items]
Management and Advisory Fees, Base Management Fees	130,637	113,384
Management and Advisory Fees, Transaction and Other Fees, Net	25	93
Management and Advisory Fees, Management Fee Offsets	(280)	(1,455)
Total Management and Advisory Fees, Net	130,382	112,022
Performance Fees Realized - Incentive Fees	10,516	39,845
Performance Fees Unrealized - Incentive Fees	47,427	18,085
Total Performance Fees	57,943	57,930
Investment Income (Loss), Realized	(10,375)	16,820
Investment Income (Loss), Unrealized	4,483	4,431
Total Investment Income	(5,892)	21,251
Interest and Dividend Revenue	3,949	2,661
Other	(1,607)	122
Total Revenues	184,775	193,986
Compensation and Benefits Compensation	56,104	40,571
Performance Fee Compensation - Realized Incentive Fees	3,470	13,271
Performance Fee Compensation - Unrealized Incentive Fees	15,651	6,761
Total Compensation and Benefits	75,225	60,603
Other Operating Expenses	21,206	19,480
Total Expenses	96,431	80,083
Economic Income (Loss)	88,344	113,903
Segment Assets	1,533,776
Operating Segments \| Credit Segment
Segment Reporting Information [Line Items]
Management and Advisory Fees, Base Management Fees	125,029	105,574
Management and Advisory Fees, Transaction and Other Fees, Net	1,457	3,344
Management and Advisory Fees, Management Fee Offsets	(7,850)	(4,252)
Total Management and Advisory Fees, Net	118,636	104,666
Performance Fees Realized - Carried Interest	13,367	19,160
Performance Fees Realized - Incentive Fees	18,431	14,018
Performance Fees Unrealized - Carried Interest	(11,951)	22,986
Performance Fees Unrealized - Incentive Fees	9,124	40,444
Total Performance Fees	28,971	96,608
Investment Income (Loss), Realized	2,237	3,071
Investment Income (Loss), Unrealized	6,887	3,079
Total Investment Income	9,124	6,150
Interest and Dividend Revenue	5,651	5,861
Other	3,493	(259)
Total Revenues	165,875	213,026
Compensation and Benefits Compensation	49,877	50,752
Performance Fee Compensation - Realized Carried Interest	6,270	11,794
Performance Fee Compensation - Realized Incentive Fees	8,401	10,380
Performance Fee Compensation - Unrealized Carried Interest	(5,656)	10,853
Performance Fee Compensation - Unrealized Incentive Fees	6,735	15,388
Total Compensation and Benefits	65,627	99,167
Other Operating Expenses	21,836	32,839
Total Expenses	87,463	132,006
Economic Income (Loss)	78,412	81,020
Segment Assets	2,563,449
Operating Segments \| Financial Advisory Segment
Segment Reporting Information [Line Items]
Management and Advisory Fees, Advisory Fees	84,238	69,963
Management and Advisory Fees, Transaction and Other Fees, Net	16	62
Total Management and Advisory Fees, Net	84,254	70,025
Investment Income (Loss), Realized	(230)	134
Investment Income (Loss), Unrealized	1,482	694
Total Investment Income	1,252	828
Interest and Dividend Revenue	3,237	2,502
Other	(956)	(175)
Total Revenues	87,787	73,180
Compensation and Benefits Compensation	68,934	61,682
Total Compensation and Benefits	68,934	61,682
Other Operating Expenses	21,342	21,342
Total Expenses	90,276	83,024
Economic Income (Loss)	(2,489)	(9,844)
Segment Assets	$ 869,846

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Investment Income (Loss) Realized represents the gains and losses on the Partnership's principal investments, including its investments in Funds that are not consolidated, its equity method investments, and other principal investments. Investment Income (Loss) is realized when the Partnership redeems all or a portion of its investment or when the Partnership receives cash income, such as dividends or distributions, from its non-consolidated funds.

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Investment Income (Loss) Unrealized represents the unrealized gains and losses on the Partnership's principal investments, including its investments in Funds that are not consolidated, its equity method investments, and other principal investments. Unrealized Investment Income (Loss) results from changes in the fair value of the underlying investment as well as the reversal of unrealized gain (loss) at the time an investment is realized.

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Management Fee Offsets

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Performance Fee Compensation - Realized Carried Interest

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Performance Fee Compensation - Unrealized Incentive Fees

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Transaction and Other Fees, Net

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Total costs of sales and operating expenses for the period.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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Amount of fees earned from providing investment advice and research to customers.

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Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

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Base revenue, as contractually stipulated, for operating and managing another entity's business during the reporting period.

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The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

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Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.

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Amount of revenue earned by the entity based on the investment results achieved. Excludes fees based upon a percentage of the assets under management not performance-related.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Expenditures for salaries other than officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

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