Related Party Transactions - Summary of Components of Due to Affiliates (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Total components due to affiliates	$ 68,492	$ 86
Accrued Stockholder Servicing Fee [Member]
Related Party Transaction [Line Items]
Total components due to affiliates	53,385
Advanced Organization and Offering Costs [Member]
Related Party Transaction [Line Items]
Total components due to affiliates	8,720
Performance Participation Allocation [Member]
Related Party Transaction [Line Items]
Total components due to affiliates	5,241
Advanced Expenses [Member]
Related Party Transaction [Line Items]
Total components due to affiliates	156	$ 86
Accrued Affiliate Service Provider Expenses [Member]
Related Party Transaction [Line Items]
Total components due to affiliates	$ 990