Investments in Unconsolidated Joint Ventures - Summary of Combined Condensed Financial Data of Unconsolidated Joint Ventures (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
ASSETS
Land	$ 348,902		$ 348,902		$ 191,853
Buildings and improvements	472,256		472,256		388,363
Accumulated depreciation	(59,916)		(59,916)		(48,306)
Investment in real estate, gross	761,242		761,242		531,910
Construction in progress	48,012		48,012		21,000
Net investment in real estate	809,254		809,254		552,910
Cash and cash equivalents	11,050		11,050		4,549
Tenant and other receivables, net	4,516		4,516		3,843
Other assets, net	37,034		37,034		45,605
Total assets	861,854		861,854		606,907
LIABILITIES AND MEMBERS INTERESTS
Mortgage loans payable, net	134,754		134,754		122,875
Accounts payable, accrued expenses and other liabilities	44,617		44,617		28,201
Total liabilities	179,371		179,371		151,076
Members Interest
Additional paid in capital	691,964		691,964		473,098
Retained earnings	(9,481)		(9,481)		(17,267)
Total members interest	682,483		682,483		455,831
Total liabilities and members interest	861,854		861,854		$ 606,907
Total revenue	12,116	$ 17,168	23,343	$ 33,512
Property operating expenses	(2,103)	(3,195)	(3,815)	(6,517)
Depreciation and amortization	(7,030)	(16,725)	(14,616)	(27,697)
Operating income	2,983	(2,752)	4,912	(702)
Other expenses	(7,298)	(331)	(14,392)	(377)
Net (loss) income	(4,315)	(3,083)	(9,480)	(1,079)
Equity in (loss) income of unconsolidated joint ventures	$ (2,158)	$ (1,542)	$ (4,740)	$ (540)