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) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2015
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Related Party Transaction [Line Items]              
Due to Adviser and Administrator [1]   $ 1,683     $ 1,683   $ 916
Annual base management fee, in percentage of stockholders' equity, in excess of recorded value of preferred stock         2.00%    
Base management fee [1]   866   $ 666 $ 1,717 $ 1,291  
Pre-incentive quarterly fee FFO in percentage of common stockholders' equity that will reward the Adviser         1.75%    
Pre-incentive annual fee FFO in percentage of common stockholders' equity that will reward the Adviser         7.00%    
Amount to be paid to Adviser in percentage of pre-incentive fee condition one         100.00%    
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]   1,760   1,527 $ 3,433 2,767  
Credits related to unconditional and irrevocable voluntary waivers issued by the Adviser [1]   1,316   957 2,500 2,162  
Related-party transactions incentive fee, net   500   500 $ 900 600  
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).    
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.    
Administration fee [1]   366   485 $ 728 977  
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   100   100 $ 200 100  
Total secured mortgages subject to financing fee   $ 40,500   27,500 $ 40,500 $ 27,500 $ 55,100
Financing fee on secured mortgages percentage   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%    
Subsequent Event [Member]              
Related Party Transaction [Line Items]              
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%            
Pre-incentive quarterly fee FFO in percentage of common stockholders' equity that will reward the Adviser 2.00%            
Pre-incentive annual fee FFO in percentage of common stockholders' equity that will reward the Adviser 8.00%            
Amount to be paid to Adviser in percentage of pre-incentive fee condition one 15.00%            
Capital gains-based incentive fee percentage 15.00%            
Notice period for termination of agreement without cause 120 days            
Notice period for termination of agreement with cause 30 days            
Dealer Manager [Member]              
Related Party Transaction [Line Items]              
Agreement termination date         Mar. 28, 2015    
Wrote-off of deferred offering costs         $ 100    
Payments made to the Dealer Manager pursuant to Dealer Manager Agreement     $ 300 $ 100   $ 100  
[1] Refer to Note 2 "Related-Party Transactions"