Annual report pursuant to Section 13 and 15(d)

Debt of the Operating Partnership - Narrative (Details)

v3.20.4
Debt of the Operating Partnership - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Jan. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Feb. 29, 2020
USD ($)
Jan. 31, 2020
Oct. 31, 2018
USD ($)
Feb. 28, 2018
USD ($)
Jan. 31, 2018
USD ($)
Aug. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
May 31, 2020
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]                                
Maximum thresholds for total leverage and unsecured leverage       0.65                     0.60  
Netting of cash balances in excess       $ 30,000,000.0                        
Property Management Fee, Percent Fee       3.00%                        
LIBOR floor interest rate       0.25%                        
Repayments of Long-term Lines of Credit                     $ 599,800,000          
Tanger Properties Limited Partnership [Member]                                
Debt Instrument [Line Items]                                
Proceeds from revolving credit facility                       $ 641,630,000 $ 282,870,000 $ 491,900,000    
Repayments of Long-term Lines of Credit                       641,630,000 427,970,000 $ 554,900,000    
Principal balance of debt                       1,578,743,000 1,582,309,000      
Tanger Properties Limited Partnership [Member] | Mortgages [Member]                                
Debt Instrument [Line Items]                                
Collateral for mortgages payable                       166,000,000.0        
Tanger Properties Limited Partnership [Member] | Mortgages [Member] | Southaven [Member]                                
Debt Instrument [Line Items]                                
Term of debt extension                 2 years              
Principal balance of debt   $ 60,000,000.0             $ 51,400,000 $ 60,000,000.0   $ 51,400,000 51,400,000      
Tanger Properties Limited Partnership [Member] | Mortgages [Member] | Southaven [Member] | London Interbank Offered Rate (LIBOR) [Member]                                
Debt Instrument [Line Items]                                
Basis spread on variable rate   1.75%             1.80%     1.80%        
Tanger Properties Limited Partnership [Member] | Line of Credit [Member]                                
Debt Instrument [Line Items]                                
Liquidity Line, Maximum Borrowings                       $ 20,000,000.0        
Syndicated Line, Maximum Borrowings                       580,000,000.0        
Line of Credit Facility, Syndicated Line, Potential Maximum Borrowings if Accordion Feature is Utilized   $ 1,200,000,000 $ 1,000,000,000.0             $ 1,200,000,000   $ 1,200,000,000        
Percentage of funds from operations allowed on a cumulative basis required for debt covenants                       95.00%        
Term of debt extension                       1 year        
Proceeds from revolving credit facility         $ 599,800,000                      
Principal balance of debt                       $ 0 0      
Facility fee percentage           0.20% 0.15%                  
Tanger Properties Limited Partnership [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]                                
Debt Instrument [Line Items]                                
Basis spread on variable rate     0.90%     1.00% 0.875%     0.875%   1.00%        
Tanger Properties Limited Partnership [Member] | Unsecured Term Loan [Member]                                
Debt Instrument [Line Items]                                
Principal balance of debt $ 325,000,000.0         $ 350,000,000.0   $ 350,000,000.0       $ 350,000,000 $ 350,000,000      
Proceeds from debt               $ 25,000,000.0                
Tanger Properties Limited Partnership [Member] | Unsecured Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]                                
Debt Instrument [Line Items]                                
Basis spread on variable rate 0.95%         1.00% 0.90% 0.90%       1.00%        
Tanger Properties Limited Partnership [Member] | Debt [Member] | Line of Credit [Member]                                
Debt Instrument [Line Items]                                
Maximum borrowing capacity   600,000,000.0 $ 520,000,000.0     $ 600,000,000.0       $ 600,000,000.0   $ 600,000,000.0        
Loan origination costs   $ 2,300,000               $ 2,300,000            
Designated as Hedging Instrument [Member]                                
Debt Instrument [Line Items]                                
Notional Amount                       $ 640,000,000        
Designated as Hedging Instrument [Member] | Southaven [Member]                                
Debt Instrument [Line Items]                                
Derivative, Fixed Interest Rate                               2.47%
Notional Amount                               $ 40,000,000.0