Real Estate - Summary of Dispositions of Net Investments in Real Estate (Detail) ft² in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) ft² Property	Sep. 30, 2019 USD ($) ft² Property	Sep. 30, 2020 USD ($) ft² Property	Sep. 30, 2019 USD ($) 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	$ 108,927	$ 59,379	$ 184,357	$ 232,400
Discontinuing Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | Property	12	5	32	17
Square feet | ft²	3,150	1,741	11,776	7,346
Net proceeds	$ 410,398	$ 212,398	$ 1,384,227	$ 1,067,808
Gains on contributions and dispositions, net	134,207	63,935	383,373	303,317
Total gains on dispositions of development properties and land, net	$ 134,207	$ 63,935	$ 383,373	$ 303,317
Continuing Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of buildings | Property	15	29	38	46
Square feet | ft²	2,558	4,130	6,635	11,517
Net proceeds	$ 409,303	$ 351,264	$ 763,615	$ 1,037,103
Gains on contributions and dispositions, net	$ 108,927	$ 59,379	$ 184,357	97,378
Continuing Operations [Member] | 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 and dispositions, net				$ 135,022