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Note 7 - Discontinued Operations and Assets Held-for-Sale (Detail) (USD $) |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 Assets Held-for-sale [Member] Unimpaired [Member] | Dec. 31, 2012 Assets Held-for-sale [Member] Operating Properties [Member] Prior to Sales [Member] Sold [Member] | Dec. 31, 2012 Assets Held-for-sale [Member] Operating Properties [Member] Impairments [Member] | Dec. 31, 2012 Assets Held-for-sale [Member] Operating Properties [Member] Fair Value [Member] | Dec. 31, 2012 Assets Held-for-sale [Member] Operating Properties [Member] Sold [Member] | Dec. 31, 2012 Assets Held-for-sale [Member] Operating Properties [Member] Additional [Member] | Dec. 31, 2012 Assets Held-for-sale [Member] Operating Properties [Member] Remaining [Member] | Dec. 31, 2012 Assets Held-for-sale [Member] Operating Properties [Member] | Dec. 31, 2010 Assets Held-for-sale [Member] Impairments [Member] | Dec. 31, 2011 Assets Held-for-sale [Member] Additional [Member] | Dec. 31, 2011 Assets Held-for-sale [Member] Prior to Sales [Member] | Dec. 31, 2010 Assets Held-for-sale [Member] Prior to Sales [Member] | Dec. 31, 2011 Assets Held-for-sale [Member] Sold [Member] | Dec. 31, 2010 Assets Held-for-sale [Member] Sold [Member] | Dec. 31, 2011 Assets Held-for-sale [Member] Transfers [Member] | Dec. 31, 2011 Assets Held-for-sale [Member] Operating Properties [Member] | Dec. 31, 2011 Assets Held-for-sale [Member] Land Parcels [Member] | Dec. 31, 2011 Assets Held-for-sale [Member] | Dec. 31, 2010 Assets Held-for-sale [Member] | Dec. 31, 2011 Operating Properties [Member] Impairments [Member] | Dec. 31, 2012 Operating Properties [Member] Impairments [Member] | Dec. 31, 2012 Operating Properties [Member] | Dec. 31, 2012 Impairments [Member] | Dec. 31, 2011 Impairments [Member] Land Parcels [Member] | Dec. 31, 2012 Impairments [Member] | Dec. 31, 2010 Impairments [Member] | Dec. 31, 2011 Impairments [Member] | Dec. 31, 2010 Transfers [Member]
Number of Real Estate Properties | 28 |  |  | 5 | 2 | 3 |  | 19 | 1 |  | 18 | 7 | 1 |  |  | 5 | 11 | 1 | 7 | 1 | 2 | 12 | 2 | 4 | 24 |  | 1 |  | 7 |  | 7
Gross Leasable Area | 3,086,000 | [1] | 2,488,000 |  |  |  |  |  |  |  | 2,100,000 |  |  |  |  |  |  |  |  |  | 200,000 | 500,000 |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Net (in Dollars) | $ 7,201,825,069 |  | $ 7,078,167,000 |  |  |  |  |  |  | $ 3,400,000 | $ 73,200,000 |  |  | $ 10,000,000 | $ 40,500,000 |  |  |  |  |  |  |  |  |  |  | $ 52,500,000 |  |  |  | $ 5,300,000 |
Real Estate Investment Property, Accumulated Depreciation (in Dollars) | 1,745,462,000 |  | 1,693,090,000 |  |  |  |  |  |  | 6,800,000 | 57,200,000 |  |  | 7,300,000 |  |  |  |  |  |  | 500,000 | 11,900,000 |  |  |  |  |  |  |  |  |
Impairment of Real Estate (in Dollars) |  |  |  |  |  | 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 | 5,200,000 | 3,900,000 |  |  |  |  | 34,100,000 | 8,700,000 |  |
Fair Value of Real Estate (in Dollars) |  |  |  |  |  |  | 102,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,700,000 | 66,100,000 |  |  |  |  |  |  |  |  |
Real Estate Held-for-sale (in Dollars) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,800,000 | $ 4,400,000 |  |  |  |  |  |  |  |  |
[1] | Gross leasable area ("GLA")

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 26 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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