Investments in Unconsolidated Real Estate Joint Ventures - Summary Statements of Operations for Unconsolidated Joint Ventures (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Expenses:
Impairment charges											$ 0
Unconsolidated Properties [Member]
Summary Statements of Operations of Unconsolidated Joint Ventures [Line Items]
Revenues									$ 93,508,000	$ 94,509,000	96,776,000
Expenses:
Property operating									36,812,000	37,121,000	36,507,000
General and administrative									271,000	266,000	350,000
Impairment charges									0	14,359,000	18,042,000
Depreciation and amortization									24,454,000	26,262,000	28,162,000
Total expenses									61,537,000	78,008,000	83,061,000
Interest expense									(16,234,000)	(14,518,000)	(10,365,000)
Other non-operating income									507,000	234,000	71,000
Total other income (expense)									(15,727,000)	(14,284,000)	(10,294,000)
Net income									16,244,000	2,217,000	3,421,000
Tanger Factory Outlet Centers, Inc. [Member]
Summary Statements of Operations of Unconsolidated Joint Ventures [Line Items]
Revenues	$ 120,492,000	$ 118,994,000	$ 115,707,000	$ 123,155,000	$ 127,199,000	$ 124,236,000	$ 119,711,000	$ 123,535,000	478,348,000	494,681,000	488,234,000
Expenses:
Property operating									157,734,000	160,457,000	155,235,000
General and administrative									53,790,000	44,167,000	44,004,000
Impairment charges									37,610,000	49,739,000	0
Depreciation and amortization									123,314,000	131,722,000	127,744,000
Total expenses									372,448,000	386,085,000	327,511,000
Interest expense									(61,672,000)	(64,821,000)	(64,825,000)
Other non-operating income									(2,761,000)	864,000	2,724,000
Total other income (expense)									(21,011,000)	(63,957,000)	(90,784,000)
Net income	$ (12,379,000)	$ 24,809,000	$ 14,457,000	$ 65,841,000	$ 20,619,000	$ (23,031,000)	$ 24,290,000	$ 23,685,000	92,728,000	45,563,000	71,876,000
The Company and Operating Partnership's share of:
Net income									7,839,000	924,000	1,937,000
Depreciation, amortization and asset impairments (real estate related)									$ 12,512,000	$ 20,494,000	$ 22,878,000