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Investment in Unconsolidated Real Estate Joint Ventures (Narrative) (Details) (USD $)
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3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | ||||||
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Mar. 31, 2012
Deer Park [Member]
SquareFeet
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Mar. 31, 2012
Deer Park Warehouse [Member]
SquareFeet
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Dec. 31, 2011
Deer Park Warehouse [Member]
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Dec. 31, 2008
Deer Park Warehouse [Member]
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Jun. 30, 2008
Deer Park Warehouse [Member]
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Mar. 31, 2012
Deer Park Warehouse [Member]
Warehouse Mortgage [Member]
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Mar. 31, 2012
Houston [Member]
SquareFeet
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Sep. 30, 2011
Houston [Member]
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Mar. 31, 2012
National Harbor [Member]
SquareFeet
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Dec. 31, 2011
National Harbor [Member]
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Mar. 31, 2012
RioCan Canda [Member]
SquareFeet
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Dec. 31, 2011
Cookstown Property [Member]
RioCan Canda [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||||||||||
| Joint Venture Formation Date | 6/1/2008 | |||||||||||
| Business Acquisition, Cost of Acquired Entity, Purchase Price | $ 3,300,000 | $ 61,200,000 | ||||||||||
| Equity Method Investment, Ownership Percentage | 33.30% | 33.30% | 50.00% | 50.00% | 50.00% | |||||||
| Debt Instrument, Maturity Date | May 17, 2011 | |||||||||||
| Debt Instrument, Debt Default, Interest Rate | 8.25% | |||||||||||
| Number of Outlet Stores | 90 | 80 | ||||||||||
| Phase One Square Footage | 350,000 | |||||||||||
| Estimated Square Footage of Real Estate Property When Completed | 470,000 | 350,000 | ||||||||||
| Purchase Price of Land Acquired | 5,600,000 | |||||||||||
| Company Portion of Contributed Capital to the Joint Venture | 13,700,000 | 850,000 | 15,100,000 | |||||||||
| Square Footage of Real Estate Property | 741,976 | 29,253 | 0 | 0 | 157,382 | |||||||
| Abandoned development costs | 954,000 | |||||||||||
| Secured Debt | 2,300,000 | |||||||||||
| Asset Impairment Charges | 900,000 | |||||||||||
| 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 | |||||||||||
| Business Acquisition, Debt Assumed, Stated Interest Rate | 5.10% | |||||||||||