Schedule of Fees, Reimbursable Expenses and Related Amounts Unpaid to Related Parties (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Offering costs	[1]		$ 3,446,000	$ 5,151,000
Operating expenses	[2]	$ 5,966,000	5,214,000	3,863,000
Acquisition fees and expenses		974,000	21,526,000	23,931,000
Total reimbursable expenses		6,070,000	9,273,000	9,628,000
Investment services fees	[3]	739,000	18,561,000	18,553,000
Disposition fee	[4]	343,000
Financing coordination fees		0	0	220,000	[5]
Property management fees		18,532,000	14,759,000	8,942,000
Asset management fees		25,443,000	17,892,000	8,481,000
Total reimbursable expenses, net		41,332,000	54,565,000	44,995,000
Offering costs, unpaid	[1],[6]		32,000
Operating expenses, unpaid	[2],[6]	1,072,000	935,000
Acquisition fees and expenses, unpaid	[6]	3,000	12,000
Total reimbursable expenses due	[6]	1,075,000	979,000
Investment services fees, unpaid	[3],[6]	17,000	182,000
Property management fees, unpaid	[6],[7]	417,000	418,000
Asset management fees, unpaid	[6],[8]	1,956,000	224,000
Total related amount unpaid	[6]	3,465,000	1,803,000
Reimbursable expense
Related Party Transaction [Line Items]
Property management fees	[7]	5,059,000	3,894,000	2,982,000
Asset management fees	[8]	29,121,000	22,837,000	13,612,000
Property Manager
Related Party Transaction [Line Items]
Acquisition fees and expenses		104,000	$ 613,000	$ 614,000
Property management fees, unpaid		$ 1,000,000

[1] Amounts are recorded as stock issuance and offering costs in the accompanying consolidated statements of stockholders’ equity and redeemable noncontrolling interest. Amounts include approximately $25,000 and $30,000 of reimbursement payments to the Advisor for services provided to the Company by its executive officers for the year ended December 31, 2015 and 2014, respectively. The reimbursement payments include components of salaries, benefits and other overhead charges.

[2] Amounts are recorded as general and administrative expenses in the accompanying consolidated statements of operations. Amounts include approximately $0.1 million, $0.1 million and $0.2 million of reimbursement payments to the Advisor for services provided to the Company by its executive officers for the years ended December 31, 2016, 2015 and 2014, respectively. The reimbursement payments include components of salaries, benefits and other overhead charges.

[3] 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.

[4] Amounts are recorded as a reduction to gain on sale of real estate in the accompanying consolidated statements of operations.

[5] 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.

[6] Amounts are recorded as due to related parties in the accompanying consolidated balance sheets.

[7] For the years ended December 31, 2016, 2015 and 2014, the Company incurred approximately $5.1 million, $3.9 million and $2.9 million, respectively, in property and construction management fees payable to the Property Manager of which approximately $0.9 million, $0.7 million and $0.9 million, respectively, in construction management fees were capitalized and included in real estate under development in the accompanying consolidated balance sheets.

[8] 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.