Summary of Status of Partnership's Unvested Equity-Based Awards (Detail) (USD $)	6 Months Ended
Jun. 30, 2013
Blackstone
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance	$ 28.19
Granted (Weighted-Average Grant Date Fair Value)	$ 17.74
Vested (Weighted-Average Grant Date Fair Value)	$ 30.16
Forfeited (Weighted-Average Grant Date Fair Value)	$ 29.92
Ending Balance	$ 27.18
Blackstone \| Blackstone Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance	66,591,089
Granted (Units)	1,112,255
Vested (Units)	(18,093,540)
Forfeited (Units)	(1,038,930)
Ending Balance	48,570,874
The 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	$ 15.76
Granted (Weighted-Average Grant Date Fair Value)	$ 13.53
Vested (Weighted-Average Grant Date Fair Value)	$ 19.98
Forfeited (Weighted-Average Grant Date Fair Value)	$ 16.16
Ending Balance	$ 14.92
The 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	$ 14.89
Granted (Weighted-Average Grant Date Fair Value)	$ 20.63
Vested (Weighted-Average Grant Date Fair Value)	$ 20.60
Ending Balance	$ 20.74
The 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	20,199,382
Granted (Units)	1,843,134
Vested (Units)	(2,723,936)
Forfeited (Units)	(584,914)
Ending Balance	18,733,666
The Blackstone Group L.P. \| Cash Settled Awards - Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance	221,356
Granted (Units)	5,384
Vested (Units)	(76,015)
Ending Balance	150,725

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of grants made 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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Subparagraph (c)(2)(i)-(ii)

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(2)

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