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

COVID-19 Pandemic (Narrative) (Details)

COVID-19 Pandemic (Narrative) (Details) - USD ($)	1 Months Ended		3 Months Ended				12 Months Ended
COVID-19 Pandemic (Narrative) (Details) - USD ($)	Jan. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Sep. 30, 2020	Aug. 31, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 29, 2020	Jan. 31, 2018	Dec. 31, 2017
Concentration Risk [Line Items]
Deferral option percentage		100.00%
Earnings reduction							$ 47,300,000
Uncollectible accounts reserve increase (decrease)							5,300,000
Straight-line rent write off							7,200,000
Percentage of rent from bankruptcy			1.00%	3.00%		10.00%
Repayments of Long-term Lines of Credit					$ 599,800,000
Dividend distributions suspended savings in cash per quarter			$ 35,000,000.0				$ 35,000,000.0
Recent Chapter 11 bankruptcy filings [Member]
Concentration Risk [Line Items]
Percentage of rent from bankruptcy							93.00%
Tanger Properties Limited Partnership [Member]
Concentration Risk [Line Items]
Repayments of Long-term Lines of Credit							$ 641,630,000	$ 427,970,000	$ 554,900,000
Principal			1,578,743,000				1,578,743,000	1,582,309,000
Tanger Properties Limited Partnership [Member] \| Line of Credit [Member]
Concentration Risk [Line Items]
Principal			0				0	0
Tanger Factory Outlet Centers, Inc. [Member]
Concentration Risk [Line Items]
Repayments of Long-term Lines of Credit							$ 641,630,000	$ 427,970,000	$ 554,900,000
Common Stock, Dividends, Per Share, Declared							$ 0.7125	$ 1.415
Debt [Member] \| Tanger Properties Limited Partnership [Member] \| Line of Credit [Member]
Concentration Risk [Line Items]
Maximum borrowing capacity			$ 600,000,000.0				$ 600,000,000.0			$ 600,000,000.0	$ 600,000,000.0	$ 520,000,000.0
Subsequent Event [Member] \| Tanger Factory Outlet Centers, Inc. [Member]
Concentration Risk [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.1775