Note 8 - Investment and Advances in Real Estate Joint Ventures (Detail) - Summarized Financial Information for KIR - Income Statements (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from rental property	$ 1,074,500,000	$ 1,115,400,000	$ 1,028,600,000
Operating expenses	(350,200,000)	(390,500,000)	(368,100,000)
Interest expense	(311,300,000)	(332,700,000)	(316,600,000)
Depreciation and amortization	(283,300,000)	(325,100,000)	(313,300,000)
Impairment charges	(15,500,000)	(20,900,000)	(3,100,000)
Other expense, net	(11,200,000)	22,900,000	(18,400,000)
	(971,500,000)	(1,046,300,000)	(1,019,500,000)
Income from continuing operations	103,000,000	69,100,000	9,100,000
Income/(loss) from discontinued operations	300,000	16,600,000	(12,400,000)
Impairment on dispositions of properties	(31,400,000)	(68,400,000)	(194,300,000)
Gain on dispositions of properties	94,500,000	(100,000)	3,100,000
Net income	166,400,000	17,200,000	(194,500,000)
KIR [Member]
Revenues from rental property	197,300,000	195,100,000	193,900,000
Operating expenses	(53,000,000)	(54,300,000)	(54,000,000)
Interest expense	(54,000,000)	(60,200,000)	(66,600,000)
Depreciation and amortization	(40,700,000)	(38,200,000)	(38,600,000)
Impairment charges	(100,000)	(500,000)	(500,000)
Other expense, net	(1,300,000)	(2,500,000)	(2,600,000)
	(149,100,000)	(155,700,000)	(162,300,000)
Income from continuing operations	48,200,000	39,400,000	31,600,000
Income/(loss) from discontinued operations	100,000	(700,000)	8,300,000
Impairment on dispositions of properties	(100,000)	(4,600,000)	(6,300,000)
Gain on dispositions of properties			5,600,000
Net income	$ 48,200,000	$ 34,100,000	$ 39,200,000