Earnings Per Unit of the Operating Partnership (Details) - Tanger Properties Limited Partnership [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income (loss) attributable to partners of the Operating Partnership	$ (23,890)	$ 14,457	$ (52,199)	$ 80,103
Less allocation of earnings to participating securities	(176)	(114)	(692)	(725)
Net income (loss) available to common shareholders/unitholders	$ (24,066)	$ 14,343	$ (52,891)	$ 79,378
Denominator:
Basic weighted average common shares (in shares)	97,543	98,147	97,480	98,205
Diluted weighted average common shares (in shares)	97,543	98,147	97,480	98,205
Basic earnings per common share/unit:
Net income (loss), basic (in dollars per share)	$ (0.25)	$ 0.15	$ (0.54)	$ 0.81
Diluted earnings per common unit:
Net income (loss), diluted (in dollars per share)	$ (0.25)	$ 0.15	$ (0.54)	$ 0.81
Antidilutive Incremental Common Shares Attributable to Notional Units	1,700	1,100	1,700	1,100
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,500	526	1,500	526