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Note 3 - Discontinued Operations (Detail) (USD $)	6 Months Ended
	Jun. 30, 2012 sqft		Jun. 30, 2011	Dec. 31, 2011 sqft
Number of Real Estate Properties	29			690
(in Square feet)	1,863,000	[1]		84,400,000
Real Estate Investment Property, Net	$ 7,087,796,000			$ 6,898,445,000
Real Estate Investment Property, Accumulated Depreciation	1,743,276,000			1,693,090,000
Impairment of Real Estate	34,600,000		12,400,000
Fair Value Of Real Estate	28,694,000			5,289,000
Assets Held-for-sale [Member] | Operating Properties [Member] | Impairment of Property Carrying Value [Member]
Number of Real Estate Properties	1
Assets Held-for-sale [Member] | Operating Properties [Member] | Sold [Member]
Number of Real Estate Properties	3
Assets Held-for-sale [Member] | Operating Properties [Member]
Number of Real Estate Properties	2
Assets Held-for-sale [Member] | Land Parcel [Member] | Sold [Member]
Number of Real Estate Properties	1
Assets Held-for-sale [Member] | Remaining [Member]
Real Estate Investment Property, Accumulated Depreciation	1,700,000
Real Estate Held-for-sale	2,800,000
Assets Held-for-sale [Member]
(in Square feet)	200,000
Real Estate Investment Property, Net	14,800,000
Real Estate Investment Property, Accumulated Depreciation	6,300,000
Impairment of Real Estate	3,400,000
Fair Value Of Real Estate	8,600,000
Impairment of Property Carrying Value [Member]
Number of Real Estate Properties	4
Impairment of Real Estate	25,600,000
Fair Value Of Real Estate	$ 28,700,000
[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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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The number of real estate properties owned as of the balance sheet date.

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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

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The cumulative amount of depreciation for real estate property held for investment purposes.

+ 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(3))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 7

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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

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