Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Detail)

v3.8.0.1
Related-Party Transactions - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 01, 2015
quarter
Jul. 31, 2015
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
officer
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Related Party Transaction [Line Items]              
Number of executive officers | officer         2    
Due to Adviser and Administrator [1]     $ 2,250,000   $ 2,250,000   $ 2,075,000
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%            
Annual base management fee, in percentage of stockholders' equity, in excess of recorded value of preferred stock (as percent) 2.00%            
Base management fee [2]     1,277,000 $ 1,072,000 $ 3,665,000 $ 2,789,000  
Pre-incentive quarterly fee FFO in percentage of common stockholders' equity that will reward the Adviser (as percent) 2.00%       1.75%    
Pre-incentive annual fee FFO in percentage of common stockholders' equity that will reward the Adviser (as percent) 8.00%       7.00%    
Amount to be paid to Adviser in percentage of pre-incentive fee condition one (as percent) 15.00%       100.00%    
Number of quarters used for the cap of average quarterly incentive fees | quarter 4            
Pre-incentive fee in percentage of common stockholders' equity that awards Adviser hundred percent of amount of pre-incentive fee, maximum percentage         2.1875%    
Amount to be paid to Adviser in percentage of pre-incentive fee condition two (as percent)         20.00%    
Pre-incentive fee in percentage of common stockholders' equity that awards the Adviser 20% of the amount of the pre-incentive fee, minimum percentage (as percent)         2.1875%    
Incentive fee [2]     640,000 564,000 $ 1,760,000 1,837,000  
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]     293,000 311,000 993,000 1,086,000  
Fees paid     $ 100,000 $ 100,000 $ 200,000 $ 200,000  
Financing fee on total secured mortgages percentage (as percent)     0.25% 0.28% 0.27% 0.36%  
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”