Fair Value Measurements - Summary of Carrying Amounts and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total assets	$ 24,173	$ 39,519
Total liabilities	8,139	48
Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Preferred equity investments		36,042
Total assets		36,042
Notes and mortgages payable	3,599,800	3,599,800
Revolving credit facility	170,000
Total liabilities	3,769,800	3,599,800
Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Preferred equity investments		36,339
Total assets		36,339
Notes and mortgages payable	3,679,756	3,617,961
Revolving credit facility	169,996
Total liabilities	$ 3,849,752	$ 3,617,961