Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Detail)

v3.3.0.814
Related-Party Transactions - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Jul. 01, 2015
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Related Party Transaction [Line Items]              
Due to Adviser and Administrator [1]   $ 1,820,000     $ 1,820,000   $ 916,000
Annual base management fee, in percentage of stockholders' equity, adjusted to unrealized gains or losses 1.50%            
Quarterly base management fee, in percentage of stockholders' equity, adjusted to unrealized gains or losses 0.375%            
Annual base management fee, in percentage of stockholders' equity, in excess of recorded value of preferred stock         2.00%    
Base management fee [1]   872,000   $ 741,000 $ 2,589,000 $ 2,031,000  
Pre-incentive quarterly fee FFO in percentage of common stockholders' equity that will reward the Adviser 2.00%       1.75%    
Pre-incentive annual fee FFO in percentage of common stockholders' equity that will reward the Adviser 8.00%       7.00%    
Amount to be paid to Adviser in percentage of pre-incentive fee condition one 15.00%       100.00%    
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).    
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         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         2.1875%    
Incentive fee [1]   621,000   1,538,000 $ 4,054,000 4,305,000  
Credits related to unconditional and irrevocable voluntary waivers issued by the Adviser   0   851,000 [1] 2,500,000 [1] 3,013,000 [1]  
Related-party transactions incentive fee, net   600,000   700,000 $ 1,600,000 1,300,000  
Capital gains-based incentive fee percentage 15.00%            
Capital gains incentive fee description         At the end of the fiscal year, if this number is positive, then the capital gain fee payable for such time period shall equal 15.0% of such amount.    
Capital gain fee   0     $ 0    
Notice period for termination of agreement without cause 120 days            
Notice period for termination of agreement with cause 30 days            
Administration fee [1]   326,000   260,000 $ 1,054,000 1,238,000  
Agreement termination date         Aug. 31, 2016    
Dealer manager fee in percentage of gross proceeds of shares of Senior Common Stock sold         7.00%    
Sales commission fee in percentage of gross proceeds of shares of Senior Common Stock sold         3.00%    
Fees paid   20,000   20,000 $ 200,000 100,000  
Total secured mortgages subject to financing fee   $ 9,200,000   $ 6,100,000 $ 64,300,000 $ 33,600,000  
Financing fee on total secured mortgages percentage   0.30%   0.30% 0.30% 0.30%  
Minimum [Member]              
Related Party Transaction [Line Items]              
Percentage of the amount of the mortgage         0.15%    
Maximum [Member]              
Related Party Transaction [Line Items]              
Percentage of the amount of the mortgage         1.00%    
Amended Advisory Agreement [Member]              
Related Party Transaction [Line Items]              
Credits related to unconditional and irrevocable voluntary waivers issued by the Adviser   $ 0          
Dealer Manager [Member]              
Related Party Transaction [Line Items]              
Agreement termination date         Mar. 28, 2015    
Wrote-off of deferred offering costs         $ 100,000    
Payments made to the Dealer Manager pursuant to Dealer Manager Agreement     $ 300,000 $ 300,000   $ 400,000  
Adviser and Administrator [Member]              
Related Party Transaction [Line Items]              
Due to Adviser and Administrator   $ 1,800,000     $ 1,800,000   $ 900,000
[1] Refer to Note 2 "Related-Party Transactions"