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Organization and Description of Business (Details) ft² in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022 ft² state building	Dec. 31, 2021
Real Estate Properties [Line Items]
Number of properties | building	551
Number of states in which the entity owned buildings | state	40
Area (in square feet) | ft²	110.1
STAG Industrial, Inc. [Member]
Real Estate Properties [Line Items]
Ownership interest in Operating Partnership (as a percent)	97.90%	98.10%

X

- Definition

Area of a real estate property.

+ References

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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 https://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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- 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.

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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

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- Details

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