Real Estate - Summary of Dispositions of Net Investments in Real Estate (Detail) ft² in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020 USD ($) ft² Property	Jun. 30, 2019 USD ($) ft² Property	Jun. 30, 2020 USD ($) ft² Property	Jun. 30, 2019 USD ($) ft² Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total gains on other dispositions of investments in real estate, net	$ 43,939	$ 27,254	$ 75,430	$ 173,021
Discontinuing Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total gains on dispositions of development properties and land, net	$ 86,416	$ 196,941	$ 249,166	$ 239,382
Discontinuing 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	9	5	18	10
Square feet \| ft²	3,990	3,723	7,514	4,935
Net proceeds	$ 340,266	$ 679,064	$ 894,609	$ 803,386
Gains on contributions, dispositions, or redemptions, net	$ 86,416	$ 196,941	$ 231,161	$ 227,774
Discontinuing 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			2	2
Square feet \| ft²			1,112	670
Net proceeds			$ 79,220	$ 52,024
Gains on contributions, dispositions, or redemptions, net			$ 18,005	$ 11,608
Continuing Operations \| 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		17
Square feet \| ft²		450		7,387
Net proceeds		$ 65,996		$ 685,839
Gains on contributions, dispositions, or redemptions, net		$ 27,254		37,999
Continuing Operations \| Dispositions to Third Parties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings \| Property	5		23
Square feet \| ft²	1,772		4,077
Net proceeds	$ 193,755		$ 354,312
Gains on contributions, dispositions, or redemptions, net	$ 43,939		$ 75,430
Continuing Operations \| Partial redemptions of investments in co-investment ventures [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gains on contributions, dispositions, or redemptions, net				$ 135,022

Area of real estate properties.

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Gains on other dispositions of investments in real estate net.

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Net gains on dispositions of development properties and land, net.

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Number of real estate properties under contributions and dispositions.

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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
-Topic 230
-SubTopic 10
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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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