Note 7 - Investment and Advances in Real Estate Joint Ventures (Details) - Summarized Financial Information for KIR - Income Statements (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Revenues from rental property	$ 935,100,000	$ 1,066,800,000	$ 1,109,300,000
Operating expenses	(297,600,000)	(348,100,000)	(388,800,000)
Interest expense	(253,600,000)	(306,900,000)	(329,400,000)
Depreciation and amortization	(242,000,000)	(277,600,000)	(322,600,000)
Impairment charges	(32,300,000)	(25,900,000)	(13,500,000)
Other expense, net	(14,500,000)	(11,300,000)	7,400,000
	(840,000,000)	(969,800,000)	(1,046,900,000)
Income from continuing operations	95,100,000	97,000,000	62,400,000
Income from discontinued operations	12,100,000	(4,000,000)	30,600,000
Impairment on dispositions of properties	(5,000,000)	(21,100,000)	(75,700,000)
Gain on dispositions of properties	223,400,000	94,500,000	(100,000)
Net income	325,600,000	166,400,000	17,200,000
KIR [Member]
Schedule of Equity Method Investments [Line Items]
Revenues from rental property	198,200,000	191,800,000	190,000,000
Operating expenses	(54,200,000)	(51,300,000)	(52,500,000)
Interest expense	(47,800,000)	(54,000,000)	(58,800,000)
Depreciation and amortization	(39,100,000)	(39,200,000)	(36,800,000)
Impairment charges			(300,000)
Other expense, net	(600,000)	(1,300,000)	(2,600,000)
	(141,700,000)	(145,800,000)	(151,000,000)
Income from continuing operations	56,500,000	46,000,000	39,000,000
Income from discontinued operations	1,500,000	2,300,000	(100,000)
Impairment on dispositions of properties	(9,800,000)	(100,000)	(4,800,000)
Gain on dispositions of properties	6,100,000
Net income	$ 54,300,000	$ 48,200,000	$ 34,100,000