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Note 5 - Other Real Estate Investments (Detail) (USD $) Share data in Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Equity Method Investments (in Dollars) | $ 1,442,240,000 |  |  | $ 1,428,155,000 |
Income (Loss) from Equity Method Investments (in Dollars) | 24,111,000 |  | 34,738,000 |  |
Number of Agreements | 1 |  |  |  |
Marketable Securities (in Dollars) | 76,786,000 | [1] |  | 36,541,000 | [1]
Albertsons [Member] | Supervalu Transaction [Member] |  |  |  |  |
Number of Real Estate Properties | 414 |  |  |  |
Payments to Acquire Equity Method Investments (in Dollars) | 22,300,000 |  |  |  |
Sale of Stock, Percentage of Ownership after Transaction | 15.20% |  |  |  |
NAI Group Holdings [Member] | Supervalu Transaction [Member] |  |  |  |  |
Number of Real Estate Properties | 456 |  |  |  |
Cost Method Investments (in Dollars) | 14,900,000 |  |  |  |
Cost Method Investment, Ownership Percentage | 15.00% |  |  |  |
Number of Grocery Banners | 4 |  |  |  |
Net Leased Properties [Member] | Preferred Equity Capital [Member] |  |  |  |  |
Number of Real Estate Properties | 392 |  |  |  |
Supervalu [Member] |  |  |  |  |
Investment Owned, Balance, Shares (in Shares) | 8.2 |  |  |  |
Supervalu Transaction [Member] |  |  |  |  |
Marketable Securities (in Dollars) | 33,600,000 |  |  |  |
Supervalu Transaction [Member] |  |  |  |  |
Investment Owned, at Cost (in Dollars) | 70,800,000 |  |  |  |
Preferred Equity Capital [Member] |  |  |  |  |
Equity Method Investments (in Dollars) | 281,800,000 |  |  |  |
Number of Real Estate Properties | 497 |  |  |  |
Income (Loss) from Equity Method Investments (in Dollars) | 9,900,000 |  | 10,200,000 |  |
Equity Method Investment, Realized Gain (Loss) on Disposal (in Dollars) | $ 4,300,000 |  | $ 3,700,000 |  |
Number of Capital Transactions | 1 |  | 8 |  |
Number of Agreements | 1 |  |  |  |
[1] | As of March 31, 2013 and December 31, 2012, the Company determined that $73.8 million and $22.4 million, respectively, of the marketable securities estimated fair value were classified within Level 1 of the fair value hierarchy and the remaining $3.3 million and $3.4 million, respectively, were classified within Level 3 of the fair value hierarchy.

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