Note 2 - Impairments (Detail) - Asset Impairment Charges (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Marketable securities and other investments		$ 1,600,000	$ 5,300,000
Investments in real estate joint ventures		5,100,000
Impairment charges	59,569,000	32,763,000	39,121,000
Income tax benefit	3,939,000	21,330,000	3,208,000
Investments Impairment Charge [Member]
Income tax benefit	(10,600,000)	(4,500,000)	(7,600,000)
Net [Member]
Impairment charges	48,600,000	29,000,000	31,400,000
Noncontrolling Interest [Member]
Impairment charges	(400,000)	700,000	(100,000)
Property Carrying Values [Member]
Real estate	56,900,000	22,800,000	8,700,000
Under Development [Member]
Real estate			11,700,000
Other Real Estate Investments [Member]
Real estate	$ 2,700,000	$ 3,300,000	$ 13,400,000