v2.4.0.8

Reconciliation of Total Segments to Income Before Provision for Taxes and Total Assets (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Fund Management Fees and Performance Fees Eliminated in Consolidation and Transactional Investment Loss | $ (5,575) | $ 43,393 | $ 21,000
Fund Expenses Added in Consolidation | 30,727 | 37,548 | 30,129
Non-Controlling Interests in Income (Loss) of Consolidated Entities | 381,872 | 203,557 | (16,916)
Transaction-Related Other Income | (4,891) | (28,353) | 178,538
Total Consolidation Adjustments and Reconciling Items | 402,133 | 256,145 | 212,751
Economic Income | 3,596,039 | 2,041,007 | 1,584,971
Amortization of Intangibles | (106,643) | (150,148) | (220,865)
IPO and Acquisition-Related Charges | (722,707) | (1,079,511) | (1,269,932)
Non-Controlling Interests in Income (Loss) of Consolidated Entities | 381,872 | 203,557 | (16,916)
Total Consolidation Adjustments and Reconciling Items | (447,478) | (1,026,102) | (1,507,713)
Income Before Provision for Taxes | $ 3,148,561 | $ 1,014,905 | $ 77,258

X
- Definition Economic Income + References No definition available. + Details
Name: | bx_EconomicIncome
Namespace Prefix: | bx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fund Expenses Added in Consolidation + References No definition available. + Details
Name: | bx_FundExpensesAddedInConsolidation
Namespace Prefix: | bx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fund Management Fees And Performance Fees Eliminated In Consolidation + References No definition available. + Details
Name: | bx_FundManagementFeesAndPerformanceFeesEliminatedInConsolidation
Namespace Prefix: | bx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition IPO And Acquisition Related Charges + References No definition available. + Details
Name: | bx_IpoAndAcquisitionRelatedCharges
Namespace Prefix: | bx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Segment Reconciliation Amortization Of Intangible Assets + References No definition available. + Details
Name: | bx_SegmentReconciliationAmortizationOfIntangibleAssets
Namespace Prefix: | bx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total Consolidation Adjustments and Reconciling Items + References No definition available. + Details
Name: | bx_TotalConsolidationAdjustmentsAndReconcilingItems
Namespace Prefix: | bx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total Consolidation Adjustments And Reconciling Items For Economic Net Income To Income Loss Before Provision For Taxes. + References No definition available. + Details
Name: | bx_TotalConsolidationAdjustmentsAndReconcilingItemsForEconomicNetIncomeToIncomeLossBeforeProvisionForTaxes
Namespace Prefix: | bx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Transaction Related Other Income + References No definition available. + Details
Name: | bx_TransactionRelatedOtherIncome
Namespace Prefix: | bx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591551-111686 + Details
Name: | us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration