Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Income Taxes (Details)

v3.20.4
Summary of Significant Accounting Policies - Income Taxes (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Common Dividends Per Share [Line Items]      
REIT annual taxable income distribution requirement percentage 90.00%    
Tanger Factory Outlet Centers, Inc. [Member]      
Schedule of Common Dividends Per Share [Line Items]      
Common dividends per share (in dollars per share) $ 0.7125 $ 1.4150 $ 1.3925
Tanger Factory Outlet Centers, Inc. [Member] | Ordinary Income [Member]      
Schedule of Common Dividends Per Share [Line Items]      
Common dividends per share (in dollars per share) 0.7125 1.3261 1.3919
Tanger Factory Outlet Centers, Inc. [Member] | Capital Gain [Member]      
Schedule of Common Dividends Per Share [Line Items]      
Common dividends per share (in dollars per share) 0 0 0.0006
Tanger Factory Outlet Centers, Inc. [Member] | Return Of Capital [Member]      
Schedule of Common Dividends Per Share [Line Items]      
Common dividends per share (in dollars per share) $ 0 $ 0.0889 $ 0