v2.4.1.9

Condensed Consolidated Statements of Changes in Partners' Capital (USD $) In Thousands, except Share data | Total USD ($) | Partners' Capital USD ($) | Appropriated Partners' Capital USD ($) | Accumulated Other Comprehensive Income USD ($) | Total USD ($) | Non-Controlling Interests in Consolidated Entities USD ($) | Non-Controlling Interests in Blackstone Holdings USD ($) | Total Partners' Capital USD ($) | Redeemable NonControlling Interests in Consolidated Entities USD ($) | Common Units
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Beginning Balance at Dec. 31, 2013 |  |  |  |  |  |  |  |  | $ 1,950,442 us-gaap_RedeemableNoncontrollingInterestEquityFairValue / us-gaap_StatementEquityComponentsAxis = bx_RedeemableNonControllingInterestsInConsolidatedEntitiesMember |
Beginning Balance at Dec. 31, 2013 |  | 6,002,592 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember | 300,708 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_AppropriatedPartnersCapitalMember | 3,466 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 6,306,766 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | 2,464,047 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember | 3,656,416 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember | 12,427,229 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Beginning Balance, Units at Dec. 31, 2013 |  |  |  |  |  |  |  |  |  | 572,592,279 us-gaap_PartnersCapitalAccountUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CapitalUnitsMember
Net Delivery of Vested Blackstone Holdings Partnership Units and Blackstone Common Units |  |  |  |  |  |  |  |  |  | 4,759,747 us-gaap_PartnersCapitalAccountUnitsSaleOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CapitalUnitsMember
Conversion of Blackstone Holdings Partnership Units to Blackstone Common Units, Units |  |  |  |  |  |  |  |  |  | 6,739,766 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CapitalUnitsMember
Transition and Acquisition Adjustments Relating to Consolidation of CLO Entities |  |  | 8,398 bx_TransitionAndAcquisitionAdjustmentsRelatingToConsolidationOfCloEntities / us-gaap_StatementEquityComponentsAxis = bx_AppropriatedPartnersCapitalMember |  | 8,398 bx_TransitionAndAcquisitionAdjustmentsRelatingToConsolidationOfCloEntities / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  |  | 8,398 bx_TransitionAndAcquisitionAdjustmentsRelatingToConsolidationOfCloEntities / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Consolidation of Fund Entity |  |  |  |  |  | 4,511 bx_NoncontrollingInterestAttributableToConsolidationOfInvestmentManagementFunds / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember |  | 4,511 bx_NoncontrollingInterestAttributableToConsolidationOfInvestmentManagementFunds / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember | 30,922 bx_NoncontrollingInterestAttributableToConsolidationOfInvestmentManagementFunds / us-gaap_StatementEquityComponentsAxis = bx_RedeemableNonControllingInterestsInConsolidatedEntitiesMember |
Net Income | 654,875 us-gaap_ProfitLoss | 265,617 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | 265,617 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | 43,961 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember | 299,505 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember | 609,083 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember | 45,792 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = bx_RedeemableNonControllingInterestsInConsolidatedEntitiesMember |
Allocation of Income / (Losses) of Consolidated CLO Entities |  |  | (39,019)bx_AllocationOfIncomeLossOfConsolidatedCloEntities / us-gaap_StatementEquityComponentsAxis = bx_AppropriatedPartnersCapitalMember |  | (39,019)bx_AllocationOfIncomeLossOfConsolidatedCloEntities / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | 39,019 bx_AllocationOfIncomeLossOfConsolidatedCloEntities / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember |  |  |  |
Currency Translation Adjustment | (1,166)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax |  |  | (1,048)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (1,048)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | (118)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember |  | (1,166)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Allocation of Currency Translation Adjustment of Consolidated CLO Entities |  |  | (118)bx_AllocationOfCurrencyTranslationAdjustmentOfConsolidatedCollateralizedLoanObligations / us-gaap_StatementEquityComponentsAxis = bx_AppropriatedPartnersCapitalMember |  | (118)bx_AllocationOfCurrencyTranslationAdjustmentOfConsolidatedCollateralizedLoanObligations / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | 118 bx_AllocationOfCurrencyTranslationAdjustmentOfConsolidatedCollateralizedLoanObligations / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember |  |  |  |
Reclassification of Currency Translation Adjustment Due to Deconsolidation of CLO Entities |  | (2,695)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | (2,695)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  |  | (2,695)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Capital Contributions |  |  |  |  |  | 147,862 us-gaap_PartnersCapitalAccountContributions / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember |  | 147,862 us-gaap_PartnersCapitalAccountContributions / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember | 282,641 us-gaap_PartnersCapitalAccountContributions / us-gaap_StatementEquityComponentsAxis = bx_RedeemableNonControllingInterestsInConsolidatedEntitiesMember |
Capital Distributions |  | (341,318)us-gaap_PartnersCapitalAccountDistributions / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | (341,318)us-gaap_PartnersCapitalAccountDistributions / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | (135,987)us-gaap_PartnersCapitalAccountDistributions / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember | (367,544)us-gaap_PartnersCapitalAccountDistributions / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember | (844,849)us-gaap_PartnersCapitalAccountDistributions / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember | (133,443)us-gaap_PartnersCapitalAccountDistributions / us-gaap_StatementEquityComponentsAxis = bx_RedeemableNonControllingInterestsInConsolidatedEntitiesMember |
Transfer of Non-Controlling Interests in Consolidated Entities |  |  |  |  |  | (212)bx_TransferOfNonControllingInterestsInConsolidatedEntitiesFunds / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember |  | (212)bx_TransferOfNonControllingInterestsInConsolidatedEntitiesFunds / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Purchase of Interests from Certain Non-Controlling Interest Holders |  | (6)bx_PurchaseOfInterestsFromCertainNonControllingInterestHolders / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | (6)bx_PurchaseOfInterestsFromCertainNonControllingInterestHolders / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  |  | (6)bx_PurchaseOfInterestsFromCertainNonControllingInterestHolders / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Deferred Tax Effects Resulting from Acquisition of Ownership Interests from Non-Controlling Interest Holders |  | 12,645 bx_DeferredTaxEffectsResultingFromAcquisitionOfOwnershipInterestsFromNonControllingInterestHolders / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | 12,645 bx_DeferredTaxEffectsResultingFromAcquisitionOfOwnershipInterestsFromNonControllingInterestHolders / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  |  | 12,645 bx_DeferredTaxEffectsResultingFromAcquisitionOfOwnershipInterestsFromNonControllingInterestHolders / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Equity-Based Compensation |  | 142,117 us-gaap_PartnersCapitalAccountUnitBasedCompensation / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | 142,117 us-gaap_PartnersCapitalAccountUnitBasedCompensation / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  | 133,128 us-gaap_PartnersCapitalAccountUnitBasedCompensation / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember | 275,245 us-gaap_PartnersCapitalAccountUnitBasedCompensation / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Relinquished with Deconsolidation and Liquidation of Partnership |  |  | (35,460)us-gaap_DeconsolidationGainOrLossAmount / us-gaap_StatementEquityComponentsAxis = bx_AppropriatedPartnersCapitalMember |  | (35,460)us-gaap_DeconsolidationGainOrLossAmount / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | (55)us-gaap_DeconsolidationGainOrLossAmount / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember |  | (35,515)us-gaap_DeconsolidationGainOrLossAmount / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Net Delivery of Vested Blackstone Holdings Partnership Units and Blackstone Common Units |  | (19,129)us-gaap_PartnersCapitalAccountSaleOfUnits / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | (19,129)us-gaap_PartnersCapitalAccountSaleOfUnits / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  |  | (19,129)us-gaap_PartnersCapitalAccountSaleOfUnits / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Excess Tax Benefits Related to Equity-Based Compensation, Net |  | 14,006 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | 14,006 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  |  | 14,006 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Change in The Blackstone Group L.P.'s Ownership Interest | (10,354)bx_ChangeOfParentOwnershipInterest | (10,354)bx_ChangeOfParentOwnershipInterest / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | (10,354)bx_ChangeOfParentOwnershipInterest / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  | 10,354 bx_ChangeOfParentOwnershipInterest / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember |  |  |
Conversion of Blackstone Holdings Partnership Units to Blackstone Common Units |  | 45,050 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | 45,050 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  | (45,050)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember |  |  |
Ending Balance at Mar. 31, 2014 |  |  |  |  |  |  |  |  | 2,176,354 us-gaap_RedeemableNoncontrollingInterestEquityFairValue / us-gaap_StatementEquityComponentsAxis = bx_RedeemableNonControllingInterestsInConsolidatedEntitiesMember |
Ending Balance at Mar. 31, 2014 |  | 6,108,525 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember | 234,509 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_AppropriatedPartnersCapitalMember | 2,418 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 6,345,452 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | 2,563,146 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember | 3,686,809 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember | 12,595,407 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Ending Balance, Units at Mar. 31, 2014 |  |  |  |  |  |  |  |  |  | 584,091,792 us-gaap_PartnersCapitalAccountUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CapitalUnitsMember
Beginning Balance at Dec. 31, 2014 | 2,441,854 us-gaap_RedeemableNoncontrollingInterestEquityFairValue |  |  |  |  |  |  |  | 2,441,854 us-gaap_RedeemableNoncontrollingInterestEquityFairValue / us-gaap_StatementEquityComponentsAxis = bx_RedeemableNonControllingInterestsInConsolidatedEntitiesMember |
Beginning Balance at Dec. 31, 2014 | 14,891,693 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest | 6,999,830 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember | 81,301 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_AppropriatedPartnersCapitalMember | (20,864)us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 7,060,267 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | 3,415,356 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember | 4,416,070 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember | 14,891,693 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Beginning Balance, Units at Dec. 31, 2014 |  |  |  |  |  |  |  |  |  | 595,624,855 us-gaap_PartnersCapitalAccountUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CapitalUnitsMember
Net Delivery of Vested Blackstone Holdings Partnership Units and Blackstone Common Units |  |  |  |  |  |  |  |  |  | 7,956,871 us-gaap_PartnersCapitalAccountUnitsSaleOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CapitalUnitsMember
Conversion of Blackstone Holdings Partnership Units to Blackstone Common Units, Units |  |  |  |  |  |  |  |  |  | 5,603,820 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CapitalUnitsMember
Consolidation of Fund Entity |  |  |  |  |  |  |  |  |  |
Net Income | 1,484,258 us-gaap_ProfitLoss | 629,448 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | 629,448 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | 153,222 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember | 645,230 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember | 1,427,900 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember | 56,358 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = bx_RedeemableNonControllingInterestsInConsolidatedEntitiesMember |
Allocation of Income / (Losses) of Consolidated CLO Entities |  |  | 51,658 bx_AllocationOfIncomeLossOfConsolidatedCloEntities / us-gaap_StatementEquityComponentsAxis = bx_AppropriatedPartnersCapitalMember |  | 51,658 bx_AllocationOfIncomeLossOfConsolidatedCloEntities / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | (51,658)bx_AllocationOfIncomeLossOfConsolidatedCloEntities / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember |  |  |  |
Currency Translation Adjustment | (50,271)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax |  |  | (21,150)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (21,150)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | (29,121)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember |  | (50,271)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Allocation of Currency Translation Adjustment of Consolidated CLO Entities |  |  | (29,121)bx_AllocationOfCurrencyTranslationAdjustmentOfConsolidatedCollateralizedLoanObligations / us-gaap_StatementEquityComponentsAxis = bx_AppropriatedPartnersCapitalMember |  | (29,121)bx_AllocationOfCurrencyTranslationAdjustmentOfConsolidatedCollateralizedLoanObligations / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | 29,121 bx_AllocationOfCurrencyTranslationAdjustmentOfConsolidatedCollateralizedLoanObligations / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember |  |  |  |
Capital Contributions |  |  |  |  |  | 141,668 us-gaap_PartnersCapitalAccountContributions / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember |  | 141,668 us-gaap_PartnersCapitalAccountContributions / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember | 178,838 us-gaap_PartnersCapitalAccountContributions / us-gaap_StatementEquityComponentsAxis = bx_RedeemableNonControllingInterestsInConsolidatedEntitiesMember |
Capital Distributions |  | (482,249)us-gaap_PartnersCapitalAccountDistributions / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | (482,249)us-gaap_PartnersCapitalAccountDistributions / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | (243,615)us-gaap_PartnersCapitalAccountDistributions / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember | (488,711)us-gaap_PartnersCapitalAccountDistributions / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember | (1,214,575)us-gaap_PartnersCapitalAccountDistributions / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember | (167,003)us-gaap_PartnersCapitalAccountDistributions / us-gaap_StatementEquityComponentsAxis = bx_RedeemableNonControllingInterestsInConsolidatedEntitiesMember |
Transfer of Non-Controlling Interests in Consolidated Entities |  |  |  |  |  | (10,163)bx_TransferOfNonControllingInterestsInConsolidatedEntitiesFunds / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember |  | (10,163)bx_TransferOfNonControllingInterestsInConsolidatedEntitiesFunds / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Deferred Tax Effects Resulting from Acquisition of Ownership Interests from Non-Controlling Interest Holders |  | 9,113 bx_DeferredTaxEffectsResultingFromAcquisitionOfOwnershipInterestsFromNonControllingInterestHolders / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | 9,113 bx_DeferredTaxEffectsResultingFromAcquisitionOfOwnershipInterestsFromNonControllingInterestHolders / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  |  | 9,113 bx_DeferredTaxEffectsResultingFromAcquisitionOfOwnershipInterestsFromNonControllingInterestHolders / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Equity-Based Compensation |  | 130,134 us-gaap_PartnersCapitalAccountUnitBasedCompensation / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | 130,134 us-gaap_PartnersCapitalAccountUnitBasedCompensation / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  | 122,236 us-gaap_PartnersCapitalAccountUnitBasedCompensation / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember | 252,370 us-gaap_PartnersCapitalAccountUnitBasedCompensation / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Net Delivery of Vested Blackstone Holdings Partnership Units and Blackstone Common Units |  | (27,632)us-gaap_PartnersCapitalAccountSaleOfUnits / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | (27,632)us-gaap_PartnersCapitalAccountSaleOfUnits / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  |  | (27,632)us-gaap_PartnersCapitalAccountSaleOfUnits / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Excess Tax Benefits Related to Equity-Based Compensation, Net |  | 23,834 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | 23,834 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  |  | 23,834 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Change in The Blackstone Group L.P.'s Ownership Interest | 68,361 bx_ChangeOfParentOwnershipInterest | 68,361 bx_ChangeOfParentOwnershipInterest / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | 68,361 bx_ChangeOfParentOwnershipInterest / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  | (68,361)bx_ChangeOfParentOwnershipInterest / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember |  |  |
Conversion of Blackstone Holdings Partnership Units to Blackstone Common Units |  | 46,123 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember |  |  | 46,123 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember |  | (46,123)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember |  |  |
Ending Balance at Mar. 31, 2015 | 2,510,047 us-gaap_RedeemableNoncontrollingInterestEquityFairValue |  |  |  |  |  |  |  | 2,510,047 us-gaap_RedeemableNoncontrollingInterestEquityFairValue / us-gaap_StatementEquityComponentsAxis = bx_RedeemableNonControllingInterestsInConsolidatedEntitiesMember |
Ending Balance at Mar. 31, 2015 | $ 15,443,937 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest | $ 7,396,962 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_PartnerCapitalMember | $ 103,838 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_AppropriatedPartnersCapitalMember | $ (42,014)us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 7,458,786 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalMember | $ 3,404,810 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestsInConsolidatedEntitiesMember | $ 4,580,341 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_NonControllingInterestInBlackstoneHoldingsMember | $ 15,443,937 us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = bx_TotalPartnersCapitalIncludingNonControllingInterestsMember |  |
Ending Balance, Units at Mar. 31, 2015 |  |  |  |  |  |  |  |  |  | 609,185,546 us-gaap_PartnersCapitalAccountUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CapitalUnitsMember

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