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Summary of Status of Partnership's Unvested Equity-Based Awards (Detail) - 6 months ended Jun. 30, 2015 - $ / shares
Total
Blackstone | Blackstone Partnership Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance 33,498,237
Granted (Units) 19,874,298
Vested (Units) (17,901,009)
Forfeited (Units) 43,916
Ending Balance 35,515,442
Beginning Balance $ 26.19
Granted (Weighted-Average Grant Date Fair Value) 37.86
Vested (Weighted-Average Grant Date Fair Value) 30.20
Forfeited (Weighted-Average Grant Date Fair Value) 25.17
Ending Balance 30.70
Blackstone Group L P | Equity Settled Awards Weighted Average Grant Date Fair Value  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance 16.95
Granted (Weighted-Average Grant Date Fair Value) 33.73
Vested (Weighted-Average Grant Date Fair Value) 18.83
Forfeited (Weighted-Average Grant Date Fair Value) 23.87
Exchanged (Weighted-Average Grant Date Fair Value) 28.23
Ending Balance 20.24
Blackstone Group L P | Cash Settled Awards Weighted Average Grant Date Fair Value  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance 31.95
Granted (Weighted-Average Grant Date Fair Value) 33.83
Vested (Weighted-Average Grant Date Fair Value) 32.62
Exchanged (Weighted-Average Grant Date Fair Value) 28.23
Ending Balance $ 28.85
Blackstone Group L P | Equity Settled Awards Deferred Restricted Common Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance 17,569,372
Granted (Units) 3,703,892
Vested (Units) (5,770,811)
Forfeited (Units) (46,452)
Exchanged (Units) (10,374)
Ending Balance 15,445,627
Blackstone Group L P | Cash Settled Awards Phantom Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance 1,455
Granted (Units) 998
Vested (Units) (815)
Exchanged (Units) 10,374
Ending Balance 12,012