Real Estate and Accumulated Depreciation (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Real Estate And Accumulated Depreciation [Line Items]
Tax cost basis of assets	$ 5,000.0	$ 9,100.0
Real estate land under development	17.7
Real estate construction in progress	37.3
Fair market value of debt adjustments and unamortized debt issuance costs	$ 1.3
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

Fair market value of debt adjustments and unamortized debt issuance costs.

No definition available.

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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

The amount of land under development included in real estate.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 6
-Subsection 28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28(Footnote 6))
-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

+ 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://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

+ 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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- Details

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- Details

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- Details

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