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.