Fair Value Measurements - Summary of Carrying Amounts and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes and mortgages payable	$ 3,819,434	$ 3,809,643
Revolving credit facility	200,000	36,918
Total liabilities	4,019,434	3,846,561
Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes and mortgages payable	3,871,899	3,848,266
Revolving credit facility	200,007	36,919
Total liabilities	$ 4,071,906	$ 3,885,185