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Organization and Description of Business (Details) ft² in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021 ft² state building	Dec. 31, 2020
Real Estate Properties [Line Items]
Number of properties	501
Number of states in which the entity owned buildings | state	39
Area (in square feet) | ft²	100.1
STAG Industrial, Inc. [Member]
Real Estate Properties [Line Items]
Ownership interest in Operating Partnership (as a percent)	97.80%	98.00%
Warehouse - Distribution buildings
Real Estate Properties [Line Items]
Number of properties	421
Light Manufacturing buildings
Real Estate Properties [Line Items]
Number of properties	73
Flex/Office Buildings
Real Estate Properties [Line Items]
Number of properties	7

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

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X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

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- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

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- 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

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- Details

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- Details

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- Details

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- Details

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