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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Related Party Transaction [Line Items]          
Due to Adviser and Administrator $ 1,737,000 [1]   $ 1,737,000 [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 666,000 [1] 451,000 [1] 1,291,000 [1] 804,000 [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 1,527,000 [1] 933,000 [1] 2,767,000 [1] 1,864,000 [1]  
Credits related to unconditional and irrevocable voluntary waivers issued by the Adviser 957,000 [1] 917,000 [1] 2,162,000 [1] 1,502,000 [1]  
Related-party transactions incentive fee, net 500,000 0 600,000 400,000  
Administration fee 485,000 [1] 367,000 [1] 977,000 [1] 730,000 [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, 2014    
Fees paid 700,000 0 700,000 0  
Extended agreement termination date     Aug. 31, 2015    
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 $ 50,000 $ 100,000 $ 100,000 $ 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"