XML 124 R93.htm IDEA: XBRL DOCUMENT v3.19.2

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Investments	$ 22,242,040		$ 22,242,040		$ 20,377,031
Cash saving in tax receivable agreements, percentage			85.00%
Expected future payments under the tax receivable agreements	739,200		$ 739,200
Expected future payments under the tax receivable agreements in years			15 years
After-tax net present value estimated payments	$ 268,200		$ 268,200
After-tax net present value discount rate assumption	15.00%		15.00%
Consolidated Blackstone Funds
Related Party Transaction [Line Items]
Investments	$ 8,633,794		$ 8,633,794		8,376,338
Founder, senior managing directors, employees and certain other related parties
Related Party Transaction [Line Items]
Net Income Attributable to Non-Controlling Interests	17,500	$ 37,000	48,500	$ 65,800
Founder, senior managing directors, employees and certain other related parties | Consolidated Blackstone Funds
Related Party Transaction [Line Items]
Investments	885,200		885,200		$ 842,900
Affiliates
Related Party Transaction [Line Items]
Interest from loans to affiliates	$ 1,800	$ 1,200	$ 4,200	$ 2,500

X

- Definition

After Tax Net Present Value Discount Rate Assumption For The Tax Receivable Agreements

+ References

No definition available.

+ Details

Name:	bx_AfterTaxNetPresentValueDiscountRateAssumptionForTaxReceivableAgreements
Namespace Prefix:	bx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

After Tax Net Present Value Estimated Payments For The Tax Receivable Agreements

+ References

No definition available.

+ Details

Name:	bx_AfterTaxNetPresentValueEstimatedPaymentsForTaxReceivableAgreements
Namespace Prefix:	bx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Cash Saving in tax receivable agreements

+ References

No definition available.

+ Details

Name:	bx_CashSavingInTaxReceivableAgreements
Namespace Prefix:	bx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expected future payments under the tax receivable agreements

+ References

No definition available.

+ Details

Name:	bx_ExpectedFuturePaymentsUnderTaxReceivableAgreements
Namespace Prefix:	bx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Expected Future Payments under Tax Receivable Agreements in Periods

+ References

No definition available.

+ Details

Name:	bx_ExpectedFuturePaymentsUnderTaxReceivableAgreementsInPeriods
Namespace Prefix:	bx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of interest income earned from interest-bearing assets owed to the entity by related party.

+ References

No definition available.

+ Details

Name:	us-gaap_InterestIncomeRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(h))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_Investments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of Net Income (Loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686

+ Details

Name:	us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	invest_InvestmentIssuerAxis=bx_ConsolidatedBlackstoneFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bx_RelatedPartiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: