Schedule - Summary of Changes in Total Real Estate and Accumulated Depreciation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance, beginning of year	$ 3,527,868us-gaap_RealEstateGrossAtCarryingValue	$ 3,477,540us-gaap_RealEstateGrossAtCarryingValue	$ 3,576,997us-gaap_RealEstateGrossAtCarryingValue
Improvements and development	103,946us-gaap_RealEstateImprovements	79,345us-gaap_RealEstateImprovements	77,040us-gaap_RealEstateImprovements
Acquisitions	20,227us-gaap_RealEstateOtherAcquisitions	59,078us-gaap_RealEstateOtherAcquisitions	0us-gaap_RealEstateOtherAcquisitions
Impairment of assets	(33,536)	(37,708)	(3,805)
Dispositions	(331,480)	(45,047)	(89)
Write-off of fully depreciated assets	(1,621)	(5,340)	(13,216)
Reclassification to held for sale	0us-gaap_RealEstateHeldforsale	0us-gaap_RealEstateHeldforsale	(159,387)us-gaap_RealEstateHeldforsale
Balance, end of year	3,285,404us-gaap_RealEstateGrossAtCarryingValue	3,527,868us-gaap_RealEstateGrossAtCarryingValue	3,477,540us-gaap_RealEstateGrossAtCarryingValue
Balance, end of year – held for sale	0us-gaap_RealEstateHeldforsale	0us-gaap_RealEstateHeldforsale	(159,387)us-gaap_RealEstateHeldforsale
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance, beginning of year	1,012,746	907,928	844,010
Depreciation expense	133,699	132,114	127,591
Impairment of assets	(13,841)	(7,742)	0
Dispositions	(69,933)	(14,214)	0
Write-off of fully depreciated assets	(1,620)	(5,340)	(13,216)
Reclassification to held for sale	0	0	(50,457)
Balance, end of year	1,061,051	1,012,746	907,928
Balance, end of year – held for sale	$ 0	$ 0	$ 50,457

Real Estate Held For Sale Accumulated Depreciation

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SEC Schedule III, Real Estate Accumulated Depreciation, Dispositions

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SEC Schedule III, Real Estate Accumulated Depreciation, Impairment Of Assets

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SEC Schedule III, Real Estate Accumulated Depreciation, Write off Of Fully Depreciated Assets

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SEC Schedule III, Real Estate, Dispositions

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SEC Schedule III, Real Estate, Write off Of Fully Depreciated Assets

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Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.FN4)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

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Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-04.(c) Schedule III)

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-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Number 210

-Section 04

-Paragraph c

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-Publisher FASB

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-Topic 970

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.4)

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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.

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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))

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- Definition

Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of increase in real estate investments from acquisitions other than through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of depreciation expense of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of write-down or reserve recognized in the income statement on real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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