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Investments in Unconsolidated Real Estate Joint Ventures (Narrative) (Details) (USD $)
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12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2012
Deer Park [Member]
sqft
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Dec. 31, 2011
Deer Park [Member]
sqft
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Oct. 31, 2003
Deer Park [Member]
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Dec. 31, 2011
Deer Park [Member]
Mezzanine Loan [Member]
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Dec. 31, 2011
Deer Park [Member]
Senior Loans [Member]
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Dec. 31, 2011
Deer Park [Member]
Senior Loans [Member]
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Dec. 31, 2012
Deer Park Warehouse [Member]
sqft
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Dec. 31, 2011
Deer Park Warehouse [Member]
sqft
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Jun. 30, 2008
Deer Park Warehouse [Member]
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Dec. 31, 2012
Deer Park Warehouse [Member]
Warehouse Mortgage [Member]
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Jun. 30, 2008
Deer Park Warehouse [Member]
Warehouse Mortgage [Member]
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Dec. 31, 2012
Houston [Member]
sqft
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Nov. 02, 2012
Houston [Member]
sqft
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Dec. 31, 2011
Houston [Member]
sqft
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Dec. 31, 2012
National Harbor [Member]
sqft
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Dec. 31, 2011
National Harbor [Member]
sqft
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Mar. 31, 2012
RioCan Canda [Member]
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Dec. 31, 2012
RioCan Canda [Member]
sqft
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Dec. 31, 2011
RioCan Canda [Member]
sqft
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Dec. 31, 2012
Westgate [Member]
sqft
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Nov. 02, 2012
Westgate [Member]
sqft
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Dec. 31, 2012
Wisconsin Dells [Member]
sqft
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Dec. 31, 2011
Wisconsin Dells [Member]
sqft
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Dec. 31, 2011
Cookstown Property [Member]
RioCan Canda [Member]
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Nov. 02, 2012
Business Acquisition Subsequent Event [Member]
RioCan Canda [Member]
outletcenters
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Nov. 02, 2012
Business Acquisition Subsequent Event [Member]
Les Factoreries St. Sauveur Property [Member]
sqft
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Nov. 02, 2012
Business Acquisition Subsequent Event [Member]
Bromont Outlet Mall Property [Member]
sqft
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| Schedule of Equity Method Investments [Line Items] | |||||||||||||||||||||||||||||
| Equity Method Investment, Ownership Percentage | 33.30% | 33.30% | 33.30% | 33.30% | 33.30% | 50.00% | 50.00% | 50.00% | 50.00% | 50.00% | 50.00% | 58.00% | 50.00% | 50.00% | |||||||||||||||
| Repayments of Long-term Debt | $ 20,000,000 | $ 500,000 | |||||||||||||||||||||||||||
| Total of Cash Contributed to the JV to Make the Mortgage Payment, Net of Cash on Hand | 19,200,000 | ||||||||||||||||||||||||||||
| Tanger's Portion of Senior Loan Payment | 6,400,000 | 6,400,000 | |||||||||||||||||||||||||||
| Business Acquisition, Cost of Acquired Entity, Purchase Price | 3,300,000 | 61,200,000 | 94,800,000 | ||||||||||||||||||||||||||
| Debt Instrument, Interest Rate Terms | LIBOR + 5.00% | LIBOR + 3.50% | LIBOR + 1.85% | ||||||||||||||||||||||||||
| Debt Instrument, Deferred Interest Rate | Prime + 5.5% | ||||||||||||||||||||||||||||
| Number of Stores | 85 | 80 | 80 | ||||||||||||||||||||||||||
| Estimated Square Footage of Real Estate Property When Completed | 470,000 | 340,000 | 410,000 | ||||||||||||||||||||||||||
| Line of Credit Facility, Maximum Borrowing Capacity | 48,300,000 | ||||||||||||||||||||||||||||
| Company Portion of Contributed Capital to the Joint Venture | 35,300,000 | 2,600,000 | 15,100,000 | 19,400,000 | |||||||||||||||||||||||||
| Square Footage of Real Estate Property | 741,981 | 656,788 | 29,253 | 29,253 | 352,705 | 353,000 | 0 | 0 | 0 | 434,562 | 159,391 | 332,234 | 332,000 | 265,086 | 265,086 | 116,000 | 163,000 | ||||||||||||
| Abandoned development costs | 1,400,000 | ||||||||||||||||||||||||||||
| Number of Outlet Centers Acquired | 2 | ||||||||||||||||||||||||||||
| Estimated Square Feet of Expansion | 131,000 | 251,000 | |||||||||||||||||||||||||||
| Secured Debt | 15,000,000 | 231,900,000 | 231,900,000 | 1,800,000 | 2,300,000 | ||||||||||||||||||||||||
| Business Acquisition, Amount of Cash Paid and Debt Assumed | 47,400,000 | ||||||||||||||||||||||||||||
| Business Acquisition, Contingent Consideration, Potential Cash Payment | 13,800,000 | ||||||||||||||||||||||||||||
| Business Acquisition, Purchase Price Allocation, Liabilities Assumed | 29,600,000 | 18,700,000 | |||||||||||||||||||||||||||
| Business Acquisition, Debt Assumed, Stated Interest Rate | 5.70% | ||||||||||||||||||||||||||||
| Equity Method Investments | 126,600,000 | 28,500,000 | 3,000,000 | 5,400,000 | 0 | 0 | 36,700,000 | 7,900,000 | 2,600,000 | 900,000 | 62,200,000 | 10,000,000 | 19,100,000 | 2,800,000 | 4,000,000 | ||||||||||||||
| Joint Venture Debt | $ 325,200,000 | $ 303,200,000 | $ 246,900,000 | $ 246,900,000 | $ 1,900,000 | $ 2,300,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 20,100,000 | $ 29,700,000 | $ 32,000,000 | $ 24,300,000 | $ 24,300,000 | ||||||||||||||
| Debt Instrument, Basis Spread on Variable Rate | 1.75% | 2.25% | |||||||||||||||||||||||||||