Fair Value Measurements - Summary of Carrying Amounts and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes and mortgages payable	$ 3,858,000	$ 3,819,434
Total liabilities	3,858,000	3,819,434
Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes and mortgages payable	3,902,911	3,871,644
Total liabilities	$ 3,902,911	$ 3,871,644