Investments in Real Estate - Schedule of Purchase Price Allocation of Properties (Detail) $ in Thousands	Sep. 30, 2020 USD ($)
Real Estate Investment Property At Cost [Abstract]
Building and building improvements	$ 2,329,887
Land and land improvements	935,344
Furniture, fixtures and equipment	44,329
In-place lease intangibles	183,885
Above-market lease intangibles	6,915
Below-market lease intangibles	(23,192)
Other	549
Total purchase price	3,477,717
Assumed mortgage notes	224,123
Net purchase price	$ 3,253,594

Above market lease intangible acquired and allocated.

No definition available.

Name:	breit_AboveMarketLeaseIntangiblesAcquiredAndAllocated
Namespace Prefix:	breit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Asset acquisitions, purchase price allocation of real estate properties.

+ References

No definition available.

+ Details

Name:	breit_AssetAcquisitionsPurchasePriceAllocationOfRealEstateProperties
Namespace Prefix:	breit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Asset acquisitions, recognized identifiable assets acquired and liabilities assumed mortgage notes payable.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Below market lease intangibles acquired and allocated.

+ References

No definition available.

+ Details

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Namespace Prefix:	breit_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fixtures and equipment gross purchase price allocation.

+ References

No definition available.

+ Details

Name:	breit_FixturesAndEquipmentGrossPurchasePriceAllocation
Namespace Prefix:	breit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Investment building and building improvements purchase price allocation.

+ References

No definition available.

+ Details

Name:	breit_InvestmentBuildingAndBuildingImprovementsPurchasePriceAllocation
Namespace Prefix:	breit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Land and land improvements purchase price allocation.

+ References

No definition available.

+ Details

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Namespace Prefix:	breit_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=121600890&loc=d3e2207-128464

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount after accumulated amortization of finite-lived and indefinite-lived intangible assets classified as other.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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