Real Estate - Summary of Dispositions (Detail) ft² in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018 USD ($) ft² Property	Jun. 30, 2017 USD ($) ft² Property	Jun. 30, 2018 USD ($) ft² Property	Jun. 30, 2017 USD ($) ft² Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gains on dispositions of investments in real estate, net	$ 94,261	$ 83,006	$ 289,372	$ 180,331
Continuing Operations [Member] \| Contributions to unconsolidated co-investment ventures [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings \| Property	3	5	11	10
Square feet \| ft²	1,164	875	4,242	3,644
Net proceeds	$ 125,917	$ 115,617	$ 665,739	$ 513,106
Gains on contributions or dispositions, net	$ 33,527	$ 37,702	$ 201,253	$ 126,068
Continuing Operations [Member] \| Dispositions to Third Parties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings \| Property	7	20	18	38
Square feet \| ft²	4,139	3,720	5,442	6,038
Net proceeds	$ 314,141	$ 216,290	$ 402,122	$ 459,679
Gains on contributions or dispositions, net	$ 60,734	$ 45,304	$ 88,119	$ 54,263

Area of real estate properties.

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Number of real estate properties under contributions and dispositions.

+ References

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- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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-Section S99
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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.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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-Publisher FASB
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