v2.4.0.6

Summary of Aggregate Notional Amount and Fair Value of Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	$ 98,632	$ 98,738
Derivative Liabilities, Fair Value	38,036	19,948
Derivative Assets, Notional	1,396,670	966,983
Derivative Liabilities, Notional	1,317,759	860,302
Fair Value Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value		67,668
Derivative Assets, Notional		450,000
Freestanding Derivatives
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	98,632	31,070
Derivative Liabilities, Fair Value	38,036	19,948
Derivative Assets, Notional	1,396,670	516,983
Derivative Liabilities, Notional	1,317,759	860,302
Freestanding Derivatives | Interest Rate Contracts | Blackstone - Other
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	52,009	768
Derivative Liabilities, Fair Value	2,565	1,291
Derivative Assets, Notional	905,450	221,350
Derivative Liabilities, Notional	770,950	502,200
Freestanding Derivatives | Interest Rate Contracts | Investments Of Consolidated Blackstone Funds
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	8,203	7,270
Derivative Liabilities, Fair Value	4,103	10,867
Derivative Assets, Notional	176,495	95,482
Derivative Liabilities, Notional	176,400	191,400
Freestanding Derivatives | Foreign Currency Contracts | Blackstone - Other
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	173	1,016
Derivative Liabilities, Fair Value	125	103
Derivative Assets, Notional	4,167	22,698
Derivative Liabilities, Notional	7,275	7,293
Freestanding Derivatives | Foreign Currency Contracts | Investments Of Consolidated Blackstone Funds
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	38,247	22,016
Derivative Liabilities, Fair Value	31,133	7,687
Derivative Assets, Notional	310,558	177,453
Derivative Liabilities, Notional	362,534	159,409
Freestanding Derivatives | Credit Default Swap | Blackstone - Other
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	110
Derivative Liabilities, Notional	$ 600

X

- Definition

Total monetary amount specified by the derivative asset(s). Expressed as an absolute value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 44C

-Subparagraph a

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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- Definition

Total monetary amount specified by the derivative liability (or liabilities). Expressed as an absolute value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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