Unconsolidated Entities - Summary of Investments in and Advances to our Unconsolidated Entities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated entities	$ 7,514,840	$ 7,602,014
Unconsolidated Co-Investment Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated entities	6,594,263	6,685,567
Other Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated entities	$ 920,577	$ 916,447