Schedule of Fees, Reimbursable Expenses and Related Amounts Unpaid to Related Parties (Parenthetical) (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Investment services fees	[1]	$ 739,000	$ 18,561,000	$ 18,553,000
Investment service fees capitalized		200,000	2,300,000	1,800,000
Financing coordination fees		0	0	220,000	[2]
Construction management fees capitalized		900,000	700,000	900,000
Asset management fees		25,443,000	17,892,000	8,481,000
Expense under Support Agreement		2,900,000	4,400,000	4,900,000
Asset management fees capitalized		800,000	600,000	300,000
Investment Services Fees
Related Party Transaction [Line Items]
Investment services fees		700,000	18,600,000	18,600,000
Reimbursable expense
Related Party Transaction [Line Items]
Advisory fee paid			25,000	30,000
Property and construction management fees payable		5,100,000	3,900,000	2,900,000
Asset management fees	[3]	29,121,000	22,837,000	13,612,000
Reimbursable expense | General and Administrative Expense
Related Party Transaction [Line Items]
Advisory fee paid		$ 100,000	$ 100,000	$ 200,000

[1] For the year ended December 31, 2016, the Company incurred approximately $0.7 million in investment services fees of which approximately $0.2 million, was capitalized and included in real estate under development in the accompanying consolidated balance sheets. For the year ended December 31, 2015, the Company incurred approximately $18.6 million in investment service fees of which approximately $2.3 million was capitalized and included in real estate under development. For the year ended December 31, 2014, the Company incurred approximately $18.6 million in investment service fees of which approximately $1.8 million was capitalized and included in real estate under development. Investment service fees, that are not capitalized, are recorded as acquisition fees and expenses in the accompanying consolidated statements of operations.

[2] For the year ended December 31, 2014, the Company incurred approximately $0.2 million in financing coordination fees, which was capitalized and included in its investment in the Windsor Manor Joint Venture. There were no financing coordination fees for the years ended December 31, 2016 and 2015.

[3] For the years ended December 31, 2016, 2015 and 2014, the Company incurred approximately $29.1 million, $22.9 million and $13.6 million, respectively, in asset management fees payable to the Advisor of which approximately $2.9 million, $4.4 million and $4.9 million, respectively, were settled in accordance with the terms of the Advisor Expense Support Agreement and approximately $0.8 million, $0.6 million and $0.3 million, respectively, were capitalized and included in real estate under development in the accompanying consolidated balance sheets.