Note 5 - Dispositions of Real Estate (Detail)	1 Months Ended	12 Months Ended														12 Months Ended		12 Months Ended									12 Months Ended															12 Months Ended
	Oct. 31, 2012 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Mar. 31, 2008	Dec. 31, 2012 Operating Properties [Member] Seller Financing [Member] Initial Dispositions [Member]	Dec. 31, 2012 Operating Properties [Member] Initial [Member] Additional Dispositions [Member]	Dec. 31, 2012 Operating Properties [Member] Initial Dispositions [Member] USD ($)	Dec. 31, 2012 Operating Properties [Member] Additional Dispositions [Member] USD ($)	Dec. 31, 2012 Operating Properties [Member]	Dec. 31, 2012 Outparcel [Member] Initial Dispositions [Member]	Dec. 31, 2012 Outparcel [Member] Additional Dispositions [Member]	Dec. 31, 2012 Outparcel [Member]	Dec. 31, 2012 Land Parcels [Member] Seller Financing [Member] Additional Dispositions [Member]	Dec. 31, 2012 Land Parcels [Member] Additional Dispositions [Member]	Dec. 31, 2010 Land Parcels [Member] Additional [Member] USD ($)	Dec. 31, 2012 Additional [Member] Additional Dispositions [Member] Land Parcels [Member]	Dec. 31, 2011 Noncontrolling Interest [Member] Disposition by Joint Venture [Member] USD ($)	Dec. 31, 2011 Initial Dispositions [Member] Financing Receivable [Member] Minimum [Member]	Dec. 31, 2011 Initial Dispositions [Member] Financing Receivable [Member] Maximum [Member]	Dec. 31, 2011 Initial Dispositions [Member] Minimum [Member]	Dec. 31, 2011 Initial Dispositions [Member] Maximum [Member]	Dec. 31, 2011 Initial Dispositions [Member] Operating Properties [Member]	Dec. 31, 2011 Initial Dispositions [Member] Development Property [Member]	Dec. 31, 2011 Initial Dispositions [Member] Outparcel [Member]	Dec. 31, 2010 Initial Dispositions [Member] Non-Recourse Mortgage [Member]	Dec. 31, 2012 Initial Dispositions [Member] USD ($)	Dec. 31, 2011 Initial Dispositions [Member] USD ($)	Dec. 31, 2010 Initial Dispositions [Member] USD ($)	Dec. 31, 2010 Additional Dispositions [Member] Land Parcels [Member] USD ($)	Dec. 31, 2010 Additional Dispositions [Member] Operating Properties [Member] USD ($)	Dec. 31, 2012 Additional Dispositions [Member] USD ($)	Dec. 31, 2011 Additional Dispositions [Member] USD ($)	Dec. 31, 2010 Additional Dispositions [Member] USD ($)	Dec. 31, 2010 Additional [Member] Land Parcels [Member] USD ($)	Dec. 31, 2012 Additional [Member] USD ($)	Dec. 31, 2012 Additional [Member] MXN	Dec. 31, 2011 Disposition by Joint Venture [Member] USD ($)	Dec. 31, 2010 Disposition by Joint Venture [Member] USD ($)	Dec. 31, 2011 Transfers [Member] Merchant Building Property [Member] USD ($)	Dec. 31, 2010 Transfers [Member] Non-Recourse Mortgage [Member]	Dec. 31, 2011 Transfers [Member] USD ($)	Dec. 31, 2010 Transfers [Member] USD ($)	Dec. 31, 2010 Additional 1 [Member] Development Property [Member] USD ($)	Dec. 31, 2012 Joint Venture in which the Company has a 20% Noncontrolling Interest [Member] USD ($)
Number of Real Estate Properties		28				1		62		24	2	2	5	1	4								27	1	1	1			7	9	3								5		3		7
Sales of Real Estate	$ 735,000,000															$ 800,000											$ 418,900,000	$ 124,900,000	$ 100,500,000	$ 25,600,000	$ 23,800,000	$ 7,100,000	$ 5,400,000			$ 1,900,000	24,300,000	$ 6,100,000	$ 40,800,000	$ 37,600,000		$ 23,900,000	$ 438,100,000		$ 55,500,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		83,253,000	17,327,000	1,961,000																							85,900,000	17,300,000
Impairment of Real Estate (in Dollars)																											22,500,000	16,900,000	5,000,000			300,000	1,600,000
Financing Receivable, Net								4,200,000	1,800,000																			11,900,000
Financing Receivable, Stated Interest Rate							6.50%	6.00%									7.50%
Gain (Loss) on Sale of Properties			12,074,000	2,130,000																									4,400,000			2,000,000		3,400,000	400,000	400,000	5,700,000							1,700,000	10,000,000
Financing Receivable, Initial Term								6 months
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners																																													20.00%
Deferred Gain on Sale of Property																																								2,100,000		100,000			2,000,000
Number of Transactions																												3
Debt Instrument, Interest Rate, Stated Percentage					8.58%														5.50%	8.00%
Financing Receivable, Term																					1 year	7 years
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax		3,084,000	23,021,000	43,366,000														100,000																				1,400,000	4,900,000
Gain (Loss) on Sale of Properties, before Applicable Income Taxes																																								14,200,000		400,000
Number of Joint Ventures																																											2
Debt Instrument, Face Amount																													81,000,000														159,900,000
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax																																							20,800,000
Discontinued Operation, Tax Effect of Income (Loss) from Discontinued Operation During Phase-out Period																																							$ 1,000,000