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Summary of Status of Partnership's Unvested Equity-Based Awards (Detail)	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Blackstone | Blackstone Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance | shares	31,554,127
Granted (Units) | shares	2,450,200
Vested (Units) | shares	(1,860,292)
Forfeited (Units) | shares	(92,956)
Ending Balance | shares	32,051,079
Beginning Balance | $ / shares	$ 34.38
Granted (Weighted-Average Grant Date Fair Value) | $ / shares	35.29
Vested (Weighted-Average Grant Date Fair Value) | $ / shares	34.71
Forfeited (Weighted-Average Grant Date Fair Value) | $ / shares	32.17
Ending Balance | $ / shares	$ 34.11
Blackstone Group L P | Equity Settled Awards Deferred Restricted Common Units And Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance | shares	9,312,268
Granted (Units) | shares	1,731,220
Vested (Units) | shares	(1,989,321)
Forfeited (Units) | shares	(268,962)
Ending Balance | shares	8,785,205
Beginning Balance | $ / shares	$ 31.43
Granted (Weighted-Average Grant Date Fair Value) | $ / shares	30.30
Vested (Weighted-Average Grant Date Fair Value) | $ / shares	29.81
Forfeited (Weighted-Average Grant Date Fair Value) | $ / shares	31.33
Ending Balance | $ / shares	$ 31.56
Blackstone Group L P | Cash Settled Awards Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance | shares	46,808
Vested (Units) | shares	(80)
Ending Balance | shares	46,728
Beginning Balance | $ / shares	$ 34.66
Vested (Weighted-Average Grant Date Fair Value) | $ / shares	33.47
Ending Balance | $ / shares	$ 38.69

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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