Segment Reporting - Summary of Financial Results by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	4 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017
Revenues:
Rental revenue	$ 21,230		$ 22,128
Tenant reimbursement income	2,206		2,273
Hotel revenue	3,748		5,174
Other revenue	1,155		1,208
Total revenues	28,339		30,783
Expenses:
Rental property operating	9,389		9,694
Hotel operating	2,109		2,949
Total expenses	11,498		12,643
Income from real estate-related securities	2,543		3,409
Segment net operating income	19,384		21,549
Depreciation and amortization	23,696	$ 0	24,786
Other income (expense):
General and administrative	(1,567)		(4,253)
Interest income	117		382
Interest expense	(5,541)		(5,547)
Performance participation allocation	(5,241)		(5,241)
Other expenses	(28)		(28)
Income tax expense	(129)		(44)
Net loss	(16,701)	$ 0	(17,968)
Multifamily [Member]
Revenues:
Rental revenue	14,036		14,556
Tenant reimbursement income	482		508
Other revenue	1,149		1,202
Total revenues	15,667		16,266
Expenses:
Rental property operating	6,667		6,885
Total expenses	6,667		6,885
Segment net operating income	9,000		9,381
Depreciation and amortization	18,240		18,599
Industrial [Member]
Revenues:
Rental revenue	6,260		6,619
Tenant reimbursement income	1,626		1,667
Total revenues	7,886		8,286
Expenses:
Rental property operating	2,549		2,635
Total expenses	2,549		2,635
Segment net operating income	5,337		5,651
Depreciation and amortization	4,217		4,444
Hotel [Member]
Revenues:
Hotel revenue	3,748		5,174
Total revenues	3,748		5,174
Expenses:
Hotel operating	2,109		2,949
Total expenses	2,109		2,949
Segment net operating income	1,639		2,225
Depreciation and amortization	763		1,257
Retail [Member]
Revenues:
Rental revenue	934		953
Tenant reimbursement income	98		98
Other revenue	6		6
Total revenues	1,038		1,057
Expenses:
Rental property operating	173		174
Total expenses	173		174
Segment net operating income	865		883
Depreciation and amortization	476		486
Real Estate-Related Securities [Member]
Expenses:
Income from real estate-related securities	2,543		3,409
Segment net operating income	$ 2,543		$ 3,409