Quarterly Financial Data of the Company (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended			24 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	Dec. 31, 2019
Diluted earnings per common share:
Gain on sale of assets									$ 43,422,000
Impairment charges											$ 0
Tanger Factory Outlet Centers, Inc. [Member]
Entity Information [Line Items]
Total 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
Net income (loss)	(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
Net income attributable to Tanger Factory Outlet Centers, Inc.	(11,749,000)	23,546,000	13,727,000	62,331,000	19,707,000	(21,859,000)	22,969,000	22,838,000	87,855,000	43,655,000	68,002,000
Income (loss) available to common shareholders of Tanger Factory Outlet Centers, Inc.	$ (12,055,000)	$ 23,241,000	$ 13,613,000	$ 61,720,000	$ 19,385,000	$ (22,172,000)	$ 22,656,000	$ 22,575,000	$ 86,519,000	$ 42,444,000	$ 66,793,000
Basic earnings per common share:
Net income (in dollars per share)	$ (0.13)	$ 0.25	$ 0.15	$ 0.66	$ 0.21	$ (0.24)	$ 0.24	$ 0.24	$ 0.93	$ 0.45	$ 0.71
Diluted earnings per common share:
Net income (in dollars per share)	$ (0.13)	$ 0.25	$ 0.15	$ 0.66	$ 0.21	$ (0.24)	$ 0.24	$ 0.24	$ 0.93	$ 0.45	$ 0.71
Gain on sale of assets									$ 43,422,000	$ 0	$ 6,943,000
Impairment charges									37,610,000	49,739,000	0
Unconsolidated Properties [Member]
Entity Information [Line Items]
Total revenues									93,508,000	94,509,000	96,776,000
Net income (loss)									16,244,000	2,217,000	3,421,000
Diluted earnings per common share:
Impairment charges									0	14,359,000	18,042,000
Unconsolidated Properties [Member] | Bromont and Les Factories St. Sauveur [Member]
Diluted earnings per common share:
Impairment charges										14,359,000	18,042,000
Company's share of impairment charge					$ 7,200,000					$ 7,180,000	$ 9,021,000
Jeffersonville [Member]
Diluted earnings per common share:
Impairment charges	$ 37,600,000					$ 49,700,000						$ 85,400,000
Nags Head, Ocean City, Park City & Williamsburg [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Diluted earnings per common share:
Gain on sale of assets				$ 43,400,000					$ 43,422,000