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Note 3 - Real Estate (Detail) - Components of Rental Property (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Land $ 2,024,300 $ 1,945,045
Buildings and improvements:    
Buildings and improvements 6,825,724 6,646,490
8,850,024 8,591,535
Accumulated depreciation and amortization (1,745,462) (1,693,090)
Total 7,104,562 6,898,445
Land [Member]
    
Land 1,927,800 1,847,770
Undeveloped Land [Member]
    
Land 96,500 97,275
Buildings [Member]
    
Buildings and improvements:    
Buildings and improvements 4,607,931 4,513,339
Building Improvements [Member]
    
Buildings and improvements:    
Buildings and improvements 1,091,810 1,024,514
Tenant Improvements [Member]
    
Buildings and improvements:    
Buildings and improvements 708,626 715,951
Fixtures And Leasehold Improvements [Member]
    
Buildings and improvements:    
Buildings and improvements 59,690 56,827
Other Rental Property [Member]
    
Buildings and improvements:    
Buildings and improvements $ 357,667 [1] $ 335,859 [1]
[1] At December 31, 2012 and 2011, Other rental property (net of accumulated amortization of $212.9 million and $180.7 million, respectively), consisted of intangible assets including (i) $237,166 and $213,915, respectively, of in-place leases, (ii) $21,335 and $21,444, respectively, of tenant relationships, and (iii) $99,166 and $100,500, respectively, of above-market leases.