|
Summary of Aggregate Notional Amount and Fair Value of Derivative Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
|
Mar. 31, 2015
|
Dec. 31, 2014
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative Assets, Notional |
$ 443,088us-gaap_DerivativeAssetNotionalAmount |
$ 719,650us-gaap_DerivativeAssetNotionalAmount |
| Derivative Liabilities, Notional |
1,499,720us-gaap_DerivativeLiabilityNotionalAmount |
1,425,901us-gaap_DerivativeLiabilityNotionalAmount |
| Derivative Assets, Fair Value |
9,557us-gaap_DerivativeFairValueOfDerivativeAsset |
15,009us-gaap_DerivativeFairValueOfDerivativeAsset |
| Derivative Liabilities, Fair Value |
48,604us-gaap_DerivativeFairValueOfDerivativeLiability |
30,528us-gaap_DerivativeFairValueOfDerivativeLiability |
| Net Investment Hedges | Foreign Currency Contracts |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative Assets, Notional |
|
62,078us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember |
| Derivative Liabilities, Notional |
53,280us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember |
|
| Derivative Assets, Fair Value |
|
523us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember |
| Derivative Liabilities, Fair Value |
408us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember |
|
| Freestanding Derivatives |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative Assets, Notional |
443,088us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember |
657,572us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember |
| Derivative Liabilities, Notional |
1,446,440us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember |
1,425,901us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember |
| Derivative Assets, Fair Value |
9,557us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember |
14,486us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember |
| Derivative Liabilities, Fair Value |
48,196us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember |
30,528us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember |
| Freestanding Derivatives | Foreign Currency Contracts | Blackstone - Other |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative Assets, Notional |
158,470us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
192,163us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
| Derivative Liabilities, Notional |
224,625us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
148,873us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
| Derivative Assets, Fair Value |
1,647us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
2,798us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
| Derivative Liabilities, Fair Value |
2,593us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
681us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
| Freestanding Derivatives | Foreign Currency Contracts | Investments Of Consolidated Blackstone Funds |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative Assets, Notional |
135,520us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
199,364us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
| Derivative Liabilities, Notional |
302,609us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
250,244us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
| Derivative Assets, Fair Value |
5,118us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
8,915us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
| Derivative Liabilities, Fair Value |
36,138us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
21,875us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
| Freestanding Derivatives | Interest Rate Contracts | Blackstone - Other |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative Assets, Notional |
109,405us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
223,886us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
| Derivative Liabilities, Notional |
780,146us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
879,412us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
| Derivative Assets, Fair Value |
451us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
407us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
| Derivative Liabilities, Fair Value |
7,458us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
4,590us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
| Freestanding Derivatives | Interest Rate Contracts | Investments Of Consolidated Blackstone Funds |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative Assets, Notional |
20,193us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
22,659us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
| Derivative Assets, Fair Value |
2,033us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
2,281us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
| Freestanding Derivatives | Credit Default Swaps | Blackstone - Other |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative Assets, Notional |
19,500us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= bx_CreditDefaultSwapsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
19,500us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= bx_CreditDefaultSwapsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
| Derivative Liabilities, Notional |
56,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= bx_CreditDefaultSwapsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
56,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= bx_CreditDefaultSwapsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
| Derivative Assets, Fair Value |
308us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= bx_CreditDefaultSwapsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
85us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= bx_CreditDefaultSwapsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
| Derivative Liabilities, Fair Value |
1,464us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= bx_CreditDefaultSwapsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
868us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= bx_CreditDefaultSwapsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_BlackstoneOtherMember |
| Freestanding Derivatives | Credit Default Swaps | Investments Of Consolidated Blackstone Funds |
|
|
| Derivatives, Fair Value [Line Items] |
|
|
| Derivative Liabilities, Notional |
83,060us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= bx_CreditDefaultSwapsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
91,372us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= bx_CreditDefaultSwapsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
| Derivative Liabilities, Fair Value |
$ 543us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= bx_CreditDefaultSwapsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |
$ 2,514us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= bx_CreditDefaultSwapsMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= bx_FreestandingDerivativesMember
/ dei_LegalEntityAxis
= bx_InvestmentsOfConsolidatedBlackstoneFundsMember |