Investment in Unconsolidated Real Estate Ventures - Summary of Financial Position of Real Estate Ventures (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Net property	$ 3,097,860			$ 3,371,231
Other assets	124,408			115,678
Other liabilities	40,537			15,985
Debt, net	1,919,511			2,144,418
Equity	1,815,782	$ 1,570,849	$ 1,603,814	1,688,303	$ 1,702,437	$ 1,729,665	$ 1,760,463	$ 1,811,028
Investment In Nonconsolidated Real Estate
Schedule of Equity Method Investments [Line Items]
Net property	1,363,889			834,367
Other assets	442,834			342,002
Other liabilities	323,442			290,071
Debt, net	833,716			585,068
Equity	$ 649,565			$ 301,230