Related Party Transactions - Additional Information (Detail) - Advisor	6 Months Ended
	Jun. 30, 2017 USD ($)
Advisory Agreement
Related Party Transaction [Line Items]
Maximum organization and offering expense reimbursement to advisor or affiliates as a percentage of gross offering proceeds	2.00%
Offering costs incurred by Advisor	$ 4,270,052
Organization costs incurred by Advisor	117,864
Reimbursements paid to advisor for organization costs	40,273
Expense Support Agreement
Related Party Transaction [Line Items]
Reimbursements paid to advisor for organization costs	0
Aggregate amount paid by the Advisor pursuant to the expense support agreement	$ 840,468