Note 23 - Supplemental Financial Information (Detail) - Quarterly Results of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from rental property(1) (in Dollars)	$ 229,073	[1]	$ 220,188	[1]	$ 220,670	[1]	$ 214,851	[1]	$ 212,465	[1]	$ 201,082	[1]	$ 206,034	[1]	$ 206,156	[1]	$ 884,782	$ 825,737	$ 786,940
Net income attributable to the Company (in Dollars)	$ 88,382		$ 54,941		$ 69,112		$ 53,638		$ 46,398		$ 54,981		$ 38,709		$ 28,963		$ 266,073	$ 169,051	$ 142,868
Net income per common share:
Basic	$ 0.14		$ 0.07		$ 0.12		$ 0.09		$ 0.08		$ 0.10		$ 0.06		$ 0.03		$ 0.42	$ 0.27	$ 0.22
Diluted	$ 0.14		$ 0.07		$ 0.12		$ 0.09		$ 0.08		$ 0.10		$ 0.06		$ 0.03		$ 0.42	$ 0.27	$ 0.22

[1] All periods have been adjusted to reflect the impact of operating properties sold during 2012 and 2011 and properties classified as held-for-sale as of December 31, 2012, which are reflected in the caption Discontinued operations on the accompanying Consolidated Statements of Income.