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Debt of the Operating Partnership (Narrative) (Details) - USD ($) |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2018 | Dec. 31, 2017 | Feb. 28, 2018 | Jan. 31, 2018 | Aug. 31, 2017 | Jul. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018
Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percent of guaranty of completion and principal guaranty |  |  |  |  |  |  | 5.00% |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percent of guaranty of completion and principal guaranty |  |  |  |  |  |  | 100.00% |  |
Tanger Properties Limited Partnership [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  | $ 1,780,562,000 |  |  |  |  | $ 1,764,591,000 |  |
Payment of make-whole premium related to early extinguishment of debt |  |  |  |  |  |  | 0 | $ 34,143,000 |
Tanger Properties Limited Partnership [Member] | Mortgages [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Net book value of collateral for mortgages payable |  |  |  |  |  |  | 183,300,000 |  |
Tanger Properties Limited Partnership [Member] | Mortgages [Member] | Southaven [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Term of mortgage extension |  |  | 2 years |  |  |  |  |  |
Principal | $ 60,000,000 | 60,000,000 | $ 51,400,000 | $ 60,000,000 |  |  | 51,400,000 |  |
Tanger Properties Limited Partnership [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Liquidity Line, Maximum Borrowings, Included in Total Line of Credit Maximum Borrowings |  |  |  |  |  |  | 20,000,000 |  |
Line of Credit Facility, Syndicated Line, Maximum Borrowings, Included in Total Line of Credit Maximum Borrowings |  |  |  |  |  |  | 580,000,000 |  |
Line of Credit Facility, Syndicated Line, Potential Maximum Borrowings if Accordion Feature is Utilized | 1,200,000,000 | 1,000,000,000 |  | $ 1,200,000,000 |  |  | 1,200,000,000 |  |
Letters of Credit |  |  |  |  |  |  | $ 6,000,000 |  |
Percentage of funds from operations allowed on a cumulative basis to pay dividends |  |  |  |  |  |  | 95.00% |  |
Term of mortgage extension |  |  |  | 1 year |  |  |  |  |
Principal |  | 208,100,000 |  |  |  |  | $ 203,100,000 |  |
Tanger Properties Limited Partnership [Member] | Senior Notes [Member] | 3.875% 2027 Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  | 300,000,000 |  |  |  | $ 300,000,000 | $ 300,000,000 |  |
Interest rate |  |  |  |  |  | 3.875% | 3.875% |  |
Net proceeds from debt offering |  |  |  |  |  | $ 295,900,000 |  |  |
Notes price |  |  |  |  |  | 99.579% |  |  |
Yield |  |  |  |  |  | 3.926% |  |  |
Tanger Properties Limited Partnership [Member] | Senior Notes [Member] | 6.125% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal |  |  |  |  | $ 300,000,000 |  |  |  |
Interest rate |  |  |  |  | 6.125% |  |  |  |
Payment of make-whole premium related to early extinguishment of debt |  |  |  |  | $ 34,100,000 |  |  |  |
Write off of unamortized debt discount and debt origination costs |  |  |  |  | $ 1,500,000 |  |  |  |
Tanger Properties Limited Partnership [Member] | Debt [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit borrowing capacity | 600,000,000 | 520,000,000 |  | $ 600,000,000 |  |  | $ 600,000,000 |  |
Debt Issuance Costs, Line of Credit Arrangements, Gross | $ 2,300,000 |  |  | $ 2,300,000 |  |  |  |  |
Tanger Factory Outlet Centers, Inc. [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Payment of make-whole premium related to early extinguishment of debt |  |  |  |  |  |  | 0 | $ 34,143,000 |
Tanger Factory Outlet Centers, Inc. [Member] | Debt [Member] | Mortgages [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of unconsolidated joint venture debt guaranteed by the Company |  |  |  |  |  |  | 28,200,000 |  |
Tanger Factory Outlet Centers, Inc. [Member] | Debt [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of unconsolidated joint venture debt guaranteed by the Company |  | $ 208,100,000 |  |  |  |  | $ 203,100,000 |  |
London Interbank Offered Rate (LIBOR) [Member] | Tanger Properties Limited Partnership [Member] | Mortgages [Member] | Southaven [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  | 1.80% |  |  |  | 1.80% |  |
London Interbank Offered Rate (LIBOR) [Member] | Tanger Properties Limited Partnership [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.90% |  | 0.875% |  |  | 0.875% |  |
Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  | $ 515,000,000 |  |
Designated as Hedging Instrument [Member] | Southaven [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Company Fixed Pay Rate |  |  |  |  |  |  |  |  | 2.47%
Notional Amount |  |  |  |  |  |  |  |  | $ 40,000,000

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