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Real Estate and Accumulated Depreciation (Parenthetical) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Real Estate And Accumulated Depreciation [Line Items] |
Tax cost basis of assets | $ 9,100.0
Real estate land under development | 40.7
Real estate construction in progress | 41.8
Fair market value of debt adjustments and unamortized debt issuance costs | $ 0.5
Tenant improvements [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Estimated useful lives of the assets | Shorter of economic life or lease terms
Minimum [Member] | Buildings [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Estimated useful lives of the assets | 20 years
Minimum [Member] | Building Improvements and Fixtures [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Estimated useful lives of the assets | 5 years
Maximum [Member] | Buildings [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Estimated useful lives of the assets | 31 years 6 months
Maximum [Member] | Building Improvements and Fixtures [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Estimated useful lives of the assets | 20 years

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- Definition The amount of construction in progress included in real estate. + References No definition available. + Details
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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Cost basis of real estate investments for federal income tax purposes 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.FN6) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 Reference 2: 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 + Details
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