v2.4.1.9

Financial Assets and Liabilities at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Blackstone's Treasury Cash Management Strategies	$ 1,631,696bx_InvestmentsInTreasuryCashManagementStrategies		$ 1,666,061bx_InvestmentsInTreasuryCashManagementStrategies
Money Market Funds	260,002bx_MoneyMarketFundsFairValue		198,278bx_MoneyMarketFundsFairValue
Net Investment Hedges - Foreign Currency Contracts			523us-gaap_NetInvestmentHedgeDerivativeAssetsAtFairValue
Freestanding Derivatives, Assets	9,557us-gaap_DerivativeFairValueOfDerivativeAsset		15,009us-gaap_DerivativeFairValueOfDerivativeAsset
Investments of Consolidated Funds	11,123,132bx_InvestmentsOfConsolidatedFunds		11,375,407bx_InvestmentsOfConsolidatedFunds
Freestanding Derivatives, Liabilities	48,604us-gaap_DerivativeFairValueOfDerivativeLiability		30,528us-gaap_DerivativeFairValueOfDerivativeLiability
Other Investments	154,069us-gaap_OtherInvestments		146,251us-gaap_OtherInvestments
Total Financial Assets	13,211,996bx_TotalFinancialAssetsFairValue		13,430,207bx_TotalFinancialAssetsFairValue
Securities Sold, Not Yet Purchased	162,111us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased		85,878us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased
Total Financial Liabilities	7,144,462us-gaap_FinancialLiabilitiesFairValueDisclosure		6,913,510us-gaap_FinancialLiabilitiesFairValueDisclosure
Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets	9,557us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember		14,486us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember
Freestanding Derivatives, Liabilities	48,196us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember		30,528us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember
Corporate Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Loans	5,902,169bx_AssetsOfConsolidatedCloVehiclesCorporateLoansFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember		6,279,592bx_AssetsOfConsolidatedCloVehiclesCorporateLoansFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Loans And Receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and Receivables	40,691us-gaap_LoansReceivableFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = bx_LoansAndReceivablesMember		40,397us-gaap_LoansReceivableFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = bx_LoansAndReceivablesMember
Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds	1,170,378bx_InvestmentFundsFairValue / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	1,103,210bx_InvestmentFundsFairValue / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Equity Securities	339,736bx_EquitySecuritiesFairValue / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	352,360bx_EquitySecuritiesFairValue / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Partnership and LLC Interests	1,746,016bx_PartnershipAndLlcInterestsFairValue / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	1,683,562bx_PartnershipAndLlcInterestsFairValue / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Debt Instruments	1,559,599us-gaap_DebtInstrumentFairValue / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	1,608,284us-gaap_DebtInstrumentFairValue / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Investments of Consolidated Funds	11,123,132bx_InvestmentsOfConsolidatedFunds / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	11,375,407bx_InvestmentsOfConsolidatedFunds / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Investments Of Consolidated Blackstone Funds | Corporate Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Loans	5,902,169bx_AssetsOfConsolidatedCloVehiclesCorporateLoansFairValueDisclosure / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember	[1]	6,279,592bx_AssetsOfConsolidatedCloVehiclesCorporateLoansFairValueDisclosure / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember	[1]
Blackstone's Treasury Cash Management Strategies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds	276,611bx_InvestmentFundsFairValue / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		307,111bx_InvestmentFundsFairValue / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Equity Securities	69,849bx_EquitySecuritiesFairValue / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		71,746bx_EquitySecuritiesFairValue / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Debt Instruments	1,223,523us-gaap_DebtInstrumentFairValue / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		1,226,195us-gaap_DebtInstrumentFairValue / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Other	61,713bx_OtherAssetsAtFairValue / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		61,009bx_OtherAssetsAtFairValue / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Total Blackstone's Treasury Cash Management Strategies	1,631,696bx_InvestmentsInTreasuryCashManagementStrategies / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		1,666,061bx_InvestmentsInTreasuryCashManagementStrategies / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Corporate Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Bonds	322,696bx_AssetsOfConsolidatedCloVehiclesCorporateBondsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember		292,690bx_AssetsOfConsolidatedCloVehiclesCorporateBondsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember
Corporate Bonds | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Bonds	322,696bx_AssetsOfConsolidatedCloVehiclesCorporateBondsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	292,690bx_AssetsOfConsolidatedCloVehiclesCorporateBondsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Foreign Currency Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Investment Hedges - Foreign Currency Contracts			523us-gaap_NetInvestmentHedgeDerivativeAssetsAtFairValue / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember
Net Investment Hedges - Foreign Currency Contracts	408us-gaap_NetInvestmentHedgeDerivativeLiabilitiesAtFairValue / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember	[1]
Foreign Currency Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets	1,647us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember		2,798us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember
Freestanding Derivatives, Liabilities	2,593us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember		681us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember
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	5,118us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	8,915us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Interest Rate Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets	451us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember		407us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember
Freestanding Derivatives, Liabilities	7,458us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember		4,590us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember
Interest Rate Contracts | Investments Of Consolidated Blackstone Funds | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets	2,033us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	2,281us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Credit Default Swaps | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets	308us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = bx_CreditDefaultSwapsMember		85us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = bx_CreditDefaultSwapsMember
Freestanding Derivatives, Liabilities	1,464us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = bx_CreditDefaultSwapsMember		868us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_InvestmentTypeAxis = bx_CreditDefaultSwapsMember
Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other	75,387bx_AssetsOfConsolidatedCloVehiclesOtherFairValueDisclosure / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember		44,513bx_AssetsOfConsolidatedCloVehiclesOtherFairValueDisclosure / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember
Other | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other	75,387bx_AssetsOfConsolidatedCloVehiclesOtherFairValueDisclosure / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember	[1]	44,513bx_AssetsOfConsolidatedCloVehiclesOtherFairValueDisclosure / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember	[1]
Liabilities of Consolidated CLO Vehicles | Foreign Currency Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	36,138us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember	[1]	21,875us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember	[1]
Liabilities of Consolidated CLO Vehicles | Credit Default Swaps | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	543us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = bx_CreditDefaultSwapsMember	[1]	2,514us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = bx_CreditDefaultSwapsMember	[1]
Liabilities of Consolidated CLO Vehicles | Senior Secured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Notes	6,587,954us-gaap_NotesPayableFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = us-gaap_SeniorNotesMember	[1]	6,448,352us-gaap_NotesPayableFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = us-gaap_SeniorNotesMember	[1]
Liabilities of Consolidated CLO Vehicles | Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Notes	345,793us-gaap_NotesPayableFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = us-gaap_SeniorSubordinatedNotesMember	[1]	348,752us-gaap_NotesPayableFairValueDisclosure / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = us-gaap_SeniorSubordinatedNotesMember	[1]
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds	260,002bx_MoneyMarketFundsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member		198,278bx_MoneyMarketFundsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Other Investments	35,379us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member		31,731us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total Financial Assets	707,752bx_TotalFinancialAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member		668,076bx_TotalFinancialAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total Financial Liabilities	2,813us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member		1,357us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities	65,706bx_EquitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	58,934bx_EquitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Investments of Consolidated Funds	65,720bx_InvestmentsOfConsolidatedFunds / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	58,947bx_InvestmentsOfConsolidatedFunds / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Level 1 | Blackstone's Treasury Cash Management Strategies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds	276,611bx_InvestmentFundsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		307,111bx_InvestmentFundsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Equity Securities	69,849bx_EquitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		71,746bx_EquitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Total Blackstone's Treasury Cash Management Strategies	346,460bx_InvestmentsInTreasuryCashManagementStrategies / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		378,857bx_InvestmentsInTreasuryCashManagementStrategies / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Level 1 | Interest Rate Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets	191us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember		263us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember
Freestanding Derivatives, Liabilities	2,813us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember		1,357us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember
Level 1 | Other | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other	14bx_AssetsOfConsolidatedCloVehiclesOtherFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember	[1]	13bx_AssetsOfConsolidatedCloVehiclesOtherFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember	[1]
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Investments	7,014us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member		7,310us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Total Financial Assets	8,700,391bx_TotalFinancialAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member		9,021,438bx_TotalFinancialAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Securities Sold, Not Yet Purchased	162,111us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member		85,878us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Total Financial Liabilities	207,902us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member		115,049us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities	87,343bx_EquitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	114,115bx_EquitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Partnership and LLC Interests	183,675bx_PartnershipAndLlcInterestsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	187,140bx_PartnershipAndLlcInterestsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Debt Instruments	1,473,038us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	1,502,314us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Investments of Consolidated Funds	7,480,837bx_InvestmentsOfConsolidatedFunds / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	7,818,427bx_InvestmentsOfConsolidatedFunds / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Level 2 | Investments Of Consolidated Blackstone Funds | Corporate Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Loans	5,387,924bx_AssetsOfConsolidatedCloVehiclesCorporateLoansFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember	[1]	5,691,517bx_AssetsOfConsolidatedCloVehiclesCorporateLoansFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember	[1]
Level 2 | Blackstone's Treasury Cash Management Strategies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instruments	1,158,707us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		1,141,301us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Other	51,618bx_OtherAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		50,850bx_OtherAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Total Blackstone's Treasury Cash Management Strategies	1,210,325bx_InvestmentsInTreasuryCashManagementStrategies / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		1,192,151bx_InvestmentsInTreasuryCashManagementStrategies / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Level 2 | Corporate Bonds | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Bonds	322,696bx_AssetsOfConsolidatedCloVehiclesCorporateBondsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	292,690bx_AssetsOfConsolidatedCloVehiclesCorporateBondsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Level 2 | Foreign Currency Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Investment Hedges - Foreign Currency Contracts			523us-gaap_NetInvestmentHedgeDerivativeAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember
Net Investment Hedges - Foreign Currency Contracts	408us-gaap_NetInvestmentHedgeDerivativeLiabilitiesAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember	[1]
Level 2 | Foreign Currency Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets	1,647us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember		2,798us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember
Freestanding Derivatives, Liabilities	2,593us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember		681us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember
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	5,118us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	8,915us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Level 2 | Interest Rate Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets	260us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember		144us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember
Freestanding Derivatives, Liabilities	4,645us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember		3,233us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember
Level 2 | Interest Rate Contracts | Investments Of Consolidated Blackstone Funds | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets	2,033us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	2,281us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_InterestRateContractMember / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Level 2 | Credit Default Swaps | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Assets	308us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = bx_CreditDefaultSwapsMember		85us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = bx_CreditDefaultSwapsMember
Freestanding Derivatives, Liabilities	1,464us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = bx_CreditDefaultSwapsMember		868us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = bx_CreditDefaultSwapsMember
Level 2 | Other | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other	19,010bx_AssetsOfConsolidatedCloVehiclesOtherFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember	[1]	19,455bx_AssetsOfConsolidatedCloVehiclesOtherFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember	[1]
Level 2 | Liabilities of Consolidated CLO Vehicles | Foreign Currency Contracts | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	36,138us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember	[1]	21,875us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = us-gaap_ForeignExchangeContractMember	[1]
Level 2 | Liabilities of Consolidated CLO Vehicles | Credit Default Swaps | Freestanding Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Freestanding Derivatives, Liabilities	543us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = bx_CreditDefaultSwapsMember	[1]	2,514us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = bx_FreestandingDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = bx_CreditDefaultSwapsMember	[1]
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Investments	111,676us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member		107,210us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Total Financial Assets	3,803,853bx_TotalFinancialAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member		3,740,693bx_TotalFinancialAssetsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Total Financial Liabilities	6,933,747us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member		6,797,104us-gaap_FinancialLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | Loans And Receivables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and Receivables	40,691us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = bx_LoansAndReceivablesMember		40,397us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = bx_LoansAndReceivablesMember
Level 3 | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Funds	1,170,378bx_InvestmentFundsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	1,103,210bx_InvestmentFundsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Equity Securities	186,687bx_EquitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	179,311bx_EquitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Partnership and LLC Interests	1,562,341bx_PartnershipAndLlcInterestsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	1,496,422bx_PartnershipAndLlcInterestsFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Debt Instruments	86,561us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	105,970us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Investments of Consolidated Funds	3,576,575bx_InvestmentsOfConsolidatedFunds / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]	3,498,033bx_InvestmentsOfConsolidatedFunds / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember	[1]
Level 3 | Investments Of Consolidated Blackstone Funds | Corporate Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate Loans	514,245bx_AssetsOfConsolidatedCloVehiclesCorporateLoansFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember	[1]	588,075bx_AssetsOfConsolidatedCloVehiclesCorporateLoansFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember	[1]
Level 3 | Blackstone's Treasury Cash Management Strategies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instruments	64,816us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		84,894us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Other	10,095bx_OtherAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		10,159bx_OtherAssetsAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Total Blackstone's Treasury Cash Management Strategies	74,911bx_InvestmentsInTreasuryCashManagementStrategies / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember		95,053bx_InvestmentsInTreasuryCashManagementStrategies / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_BlackstoneTreasuryCashManagementStrategiesMember
Level 3 | Other | Investments Of Consolidated Blackstone Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other	56,363bx_AssetsOfConsolidatedCloVehiclesOtherFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember	[1]	25,045bx_AssetsOfConsolidatedCloVehiclesOtherFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / dei_LegalEntityAxis = bx_InvestmentsOfConsolidatedBlackstoneFundsMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedSecuritiesOtherMember	[1]
Level 3 | Liabilities of Consolidated CLO Vehicles | Senior Secured Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Notes	6,587,954us-gaap_NotesPayableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = us-gaap_SeniorNotesMember	[1]	6,448,352us-gaap_NotesPayableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = us-gaap_SeniorNotesMember	[1]
Level 3 | Liabilities of Consolidated CLO Vehicles | Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of Notes	$ 345,793us-gaap_NotesPayableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = us-gaap_SeniorSubordinatedNotesMember	[1]	$ 348,752us-gaap_NotesPayableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByLiabilityClassAxis = bx_LiabilitiesOfConsolidatedCloVehiclesMember / us-gaap_InvestmentTypeAxis = us-gaap_SeniorSubordinatedNotesMember	[1]
[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, is presumed to have control. 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.

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