Investments in Unconsolidated Joint Ventures - Summary of Financial Information of Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Method Investments And Joint Ventures [Abstract]
Real estate, net	$ 1,236,989	$ 1,196,116
Intangible assets	97,658	126,422
Other assets	91,552	81,596
Total assets	1,426,199	1,404,134
Notes and mortgages payable, net	887,882	886,902
Other liabilities	22,310	14,196
Total liabilities	910,192	901,098
Equity	516,007	503,036
Total liabilities and equity	1,426,199	1,404,134
Rental income	113,156	113,643	$ 54,420
Tenant reimbursement income	27,178	25,161	4,495
Fee and other income	7,146	1,622	1,882
Total revenues	147,480	140,426	60,797
Operating	53,417	51,390	23,670
Depreciation and amortization	48,452	46,409	12,509
Total expenses	101,869	97,799	36,179
Operating income	45,611	42,627	24,618
Interest and other income	803	381	68
Interest and debt expense	(39,406)	(33,461)	(12,212)
Unrealized gain on interest rate swaps		1,896	4,109
Net income before income taxes	7,008	11,443	16,583
Income tax expense	(10)	(2)	(10)
Net income	$ 6,998	$ 11,441	$ 16,573