Note 6 - Other Real Estate Investments (Detail) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Equity Method Investments	$ 1,436,038,000		$ 1,404,214,000
Number of Real Estate Properties	29		690
Income (Loss) from Equity Method Investments	79,246,000	30,169,000	30,200,000
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
Other [Member] | The Company's Share [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
Preferred Equity Capital [Member]
Equity Method Investments	311,600,000
Number of Real Estate Properties	520
Income (Loss) from Equity Method Investments	16,600,000	9,100,000
Equity Method Investment, Realized Gain (Loss) on Disposal	$ 4,500,000	$ 900,000
Number of Capital Transactions	8	4
Number of Agreements	1