Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions - Additional Information (Detail)

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Related-Party Transactions - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jul. 01, 2015
Jul. 31, 2015
Dec. 31, 2019
USD ($)
officer
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Related Party Transaction [Line Items]          
Number of executive officers | officer     2    
Due to adviser and administrator [1]     $ 2,904,000 $ 2,523,000  
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]     $ 5,174,000 5,054,000 $ 4,959,000
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%        
Incentive fee description     However, in no event shall the incentive fee for a particular quarter exceed by 15.0% (the cap) the average quarterly incentive fee paid by us for the previous four quarters (excluding quarters for which no incentive fee was paid).    
Incentive fee [2]     $ 3,688,000 3,042,000 2,422,000
Portion of incentive fee waived     0 0 0
Capital gains-based incentive fee percentage (as percent) 15.00%        
Capital gain fee     0 0 0
Notice period for termination of agreement without cause   120 days      
Percentage of independent directors to terminate the Amended Advisory Agreement (as a percent)   66.67%      
Termination fee payable (as percent)   200.00%      
Notice period for termination of agreement with cause   30 days      
Administration fee [2]     1,690,000 1,605,000 1,272,000
Fees paid     $ 200,000 $ 100,000 $ 200,000
Financing fee on total secured mortgages (as percent)     0.20% 0.11% 0.24%
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”