Tanger Inc. Annual report pursuant to Section 13 and 15(d)

Disposition of Property (Details)	1 Months Ended			3 Months Ended		12 Months Ended
Disposition of Property (Details)	Aug. 31, 2020 USD ($) ft²	Jul. 31, 2019 USD ($) ft²	Mar. 31, 2019 USD ($) ft²	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2020 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet \| ft²						878,000
Net Sales Price						$ 128,505,000
Gain on sale of assets						$ 43,422,000
Terrell [Member] \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet \| ft²	178,000
Net Sales Price	$ 7,626,000
Gain on sale of assets	$ 2,324,000			$ 2,300,000
Nags Head, Ocean City, Park City & Williamsburg [Member] \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet \| ft²			878,000
Net Sales Price			$ 128,248,000
Gain on sale of assets			$ 43,422,000		$ 43,400,000
Land outparcel [Member] \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet \| ft²		0
Net Sales Price		$ 257,000
Gain on sale of assets		$ 0