Note 11 - Mortgages Payable (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012		Dec. 31, 2011
Number of Real Estate Properties	26		690
Unamortized Fair Value Debt Adjustments	$ 9,800,000
Repayments of Secured Debt	212,100,000
Mortgage Loans on Real Estate, Number of Loans	3
Secured Debt	1,015,313,000	[1]	1,085,371,000	[1]
Mortgage Loans on Real Estate, Minimum Interest Rate in Range	0.21%
Mortgage Loans on Real Estate, Maximum Interest Rate in Range	9.75%
Debt, Weighted Average Interest Rate	6.16%
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	31,700,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	123,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	225,200,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	131,800,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	233,700,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	260,100,000
Acquisitions [Member]
Business Acquisition, Purchase Price Allocation, Liabilities Assumed	163,400,000
Number of Real Estate Properties	6
Unamortized Fair Value Debt Adjustments	4,200,000
Repayment of Debt [Member]
Number of Real Estate Properties	14
Assigned [Member]
Secured Debt	$ 13,700,000

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