Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Detail)

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Related-Party Transactions - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jan. 10, 2017
quarter
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
officer
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Related Party Transaction [Line Items]            
Number of executive officers | officer       2    
Amount due to Adviser and Administrator [1]   $ 2,352,000   $ 2,352,000   $ 2,289,000
Annual base management fee, in percentage of stockholders' equity, adjusted to unrealized gains or losses (as percent) 1.50%          
Quarterly base management fee, in percentage of stockholders' equity, adjusted to unrealized gains or losses (as percent) 0.375%          
Base management fee [2]   1,260,000 $ 1,207,000 2,556,000 $ 2,387,000  
Pre-incentive quarterly fee FFO in percentage of common stockholders' equity that will reward the Adviser (as percent) 2.00%          
Pre-incentive annual fee FFO in percentage of common stockholders' equity that will reward the Adviser (as percent) 8.00%          
Amount to be paid to Adviser in percentage of pre-incentive fee condition one (as percent) 15.00%          
Number of quarters used for the cap of average quarterly incentive fees | quarter 4          
Incentive fee [2]   733,000 551,000 1,429,000 1,120,000  
Portion of incentive fee waived   0 0 0 0  
Capital gains-based incentive fee (as percent) 15.00%          
Capital gain fee   0 0 0 0  
Notice period for termination of agreement without cause 120 days          
Percentage of independent directors to terminate the Amended Advisory Agreement (as percent) 66.67%          
Termination fee payable (as percent) 200.00%          
Notice period for termination of agreement with cause 30 days          
Administration fee [2]   360,000 340,000 747,000 700,000  
Fees paid   $ 1,000 $ 60,000 $ 20,000 $ 60,000  
Financing fee on total secured mortgages percentage (as percent)   0.01% 0.31% 0.11% 31.00%  
Minimum            
Related Party Transaction [Line Items]            
Percentage of the amount of the mortgage (as percent)       0.15%    
Maximum            
Related Party Transaction [Line Items]            
Percentage of the amount of the mortgage (as percent)       1.00%    
[1] Refer to Note 2 “Related-Party Transactions”
[2] Refer to Note 2 “Related-Party Transactions”