Schedule III - Changes in Total Real Estate Assets Including Real Estate Held for Sale (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Balance at beginning of period	$ 1,733,194us-gaap_RealEstateGrossAtCarryingValue	$ 1,189,552us-gaap_RealEstateGrossAtCarryingValue	$ 1,191,096us-gaap_RealEstateGrossAtCarryingValue
Acquisitions	263,811us-gaap_RealEstateOtherAcquisitions	480,503us-gaap_RealEstateOtherAcquisitions	9,460us-gaap_RealEstateOtherAcquisitions
Transfers from construction in progress	41,772	81,347	37,174
Additions	84,831us-gaap_RealEstateOtherAdditions	7,749us-gaap_RealEstateOtherAdditions	19,971us-gaap_RealEstateOtherAdditions
Dispositions	(56,590)us-gaap_RealEstateCostOfRealEstateSold	(28,616)us-gaap_RealEstateCostOfRealEstateSold	(68,149)us-gaap_RealEstateCostOfRealEstateSold
Other	(26,291)	2,659
Balance at end of period	$ 2,040,727us-gaap_RealEstateGrossAtCarryingValue	$ 1,733,194us-gaap_RealEstateGrossAtCarryingValue	$ 1,189,552us-gaap_RealEstateGrossAtCarryingValue

Real Estate Accumulated Depreciation Capital Expenditures And Transfers From Construction In Progress

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- Definition

Amount of real estate investments sold 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 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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.4)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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- Definition

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

+ References

+ Details

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- Definition

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.

+ References

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- Definition

Amount of other additions excluding acquisition or improvement to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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- Definition

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

+ References

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