v2.4.1.9
Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Schedule of Investments [Line Items]    
Investments of Consolidated Blackstone Funds $ 11,123,132bx_InvestmentsOfConsolidatedFunds $ 11,375,407bx_InvestmentsOfConsolidatedFunds
Equity Method Investments 3,144,959us-gaap_EquityMethodInvestments 3,240,825us-gaap_EquityMethodInvestments
Blackstone's Treasury Cash Management Strategies 1,631,696bx_InvestmentsInTreasuryCashManagementStrategies 1,666,061bx_InvestmentsInTreasuryCashManagementStrategies
Performance Fees 6,842,398bx_PerformanceFeesReceivable 6,337,045bx_PerformanceFeesReceivable
Other Investments 154,069us-gaap_OtherInvestments 146,251us-gaap_OtherInvestments
Investments $ 22,896,254us-gaap_Investments $ 22,765,589us-gaap_Investments