Real Estate - Summary of Dispositions of Net Investments in Real Estate (Detail) ft² in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) ft² Property	Mar. 31, 2020 USD ($) ft² Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gains on dispositions of development properties and land, net	$ 173,643	$ 162,750
Gains on other dispositions of investments in real estate, net	$ 16,623	$ 31,491
Discontinuing Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | Property	8	11
Square feet | ft²	4,287	4,636
Net proceeds	$ 769,813	$ 633,563
Continuing Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | Property	1	18
Square feet | ft²	476	2,305
Net proceeds	$ 23,342	$ 160,557