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 $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Related Party Transaction [Line Items]          
Due to Adviser and Administrator $ 1,688,000 [1]   $ 1,688,000 [1]   $ 1,360,000 [1]
Annual base management fee, in percentage of stockholders' equity, in excess of recorded value of preferred stock     2.00%    
Base management fee 741,000 [1] 559,000 [1] 2,031,000 [1] 1,363,000 [1]  
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 1,538,000 [1] 1,138,000 [1] 4,305,000 [1] 3,001,000 [1]  
Credits related to unconditional and irrevocable voluntary waivers issued by the Adviser 851,000 [1] 989,000 [1] 3,013,000 [1] 2,491,000 [1]  
Related-party transactions incentive fee, net 700,000 100,000 1,300,000 500,000  
Administration fee 260,000 [1] 274,000 [1] 1,238,000 [1] 1,004,000 [1]  
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%    
Agreement termination date     Aug. 31, 2015    
Fees paid 20,000 40,000 100,000 40,000  
Minimum [Member]
          
Related Party Transaction [Line Items]          
Percentage of the amount of the mortgage     0.50%    
Maximum [Member]
          
Related Party Transaction [Line Items]          
Percentage of the amount of the mortgage     1.00%    
Dealer Manager [Member]
          
Related Party Transaction [Line Items]          
Payments made to the Dealer Manager pursuant to Dealer Manager Agreement $ 300,000 $ 50,000 $ 400,000 $ 200,000  
Agreement termination date     Mar. 28, 2015    
Agreement termination on senior common stock shares issued     3,000,000    
[1] Refer to Note 2 "Related-Party Transactions"