Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Detail)

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Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]            
Management fee due to Adviser $ 703   $ 703   $ 703 $ 666
Credit to Fees Due to Advisor (174)   (174)   (174) 0
Other due to Adviser 3   3   3 16
Total due to Adviser 532   532   532 682
Administration fee due to Administrator 275   275   275 258
Total due to Administrator 275   275   275 258
Total due to related parties 807   807   807 940
Administration fee 275 $ 219 549 $ 445    
Taxable REIT Subsidiary            
Related Party Transaction [Line Items]            
Professional fees 43   118   $ 189 $ 71
Administration fee $ 17   $ 30