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Note 6 - Other Real Estate Investments (Detail) (USD $)
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Equity Method Investments $ 1,433,450,000   $ 1,404,214,000
Number of Real Estate Properties 26   690
Income (Loss) from Equity Method Investments 103,743,000 49,810,000  
Number of Agreements 1    
Equity Method Investment, Ownership Percentage 20.00%    
Net Leased Properties [Member] | Preferred Equity Capital [Member]
     
Number of Real Estate Properties 397    
Preferred Equity Capital [Member]
     
Equity Method Investments 297,400,000    
Number of Real Estate Properties 509    
Income (Loss) from Equity Method Investments 26,000,000 19,800,000  
Equity Method Investment, Realized Gain (Loss) on Disposal 6,600,000 3,900,000  
Number of Capital Transactions 17 7  
Number of Agreements 1    
The Company's Share [Member] | Other [Member]
     
Distributed Earnings 6,900,000    
Other [Member]
     
Income (Loss) from Equity Method Investments 6,900,000    
Equity Method Investment, Ownership Percentage 13.40%    
Distributed Earnings $ 50,300,000