Note 11 - Mortgages Payable (Detail) (USD $)	6 Months Ended
	Jun. 30, 2012		Dec. 31, 2011
Number of Real Estate Properties	29		690
Unamortized Fair Value Debt Adjustments	$ 9,800,000
Repayments of Secured Debt	200,300,000
Mortgage Loans on Real Estate, Number of Loans	1
Secured Debt	990,586,000	[1]	1,085,371,000	[1]
Mortgage Loans on Real Estate, Minimum Interest Rate in Range	0.25%
Mortgage Loans on Real Estate, Maximum Interest Rate in Range	9.75%
Debt, Weighted Average Interest Rate	6.28%
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	41,500,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	129,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	224,900,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	110,600,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	233,300,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	241,500,000
Acquisitions [Member]
Business Acquisition, Purchase Price Allocation, Liabilities Assumed	120,000,000
Number of Real Estate Properties	4
Unamortized Fair Value Debt Adjustments	3,200,000
Repayment of Debt [Member]
Number of Real Estate Properties	11
Assigned [Member]
Secured Debt	$ 1,300,000

[1] The Company determined that its valuation of these liabilities was classified within Level 3 of the fair value hierarchy.