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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Related Party Transaction [Line Items]          
Due to the Adviser and Administrator $ 999,000 [1]   $ 999,000 [1]   $ 1,175,000 [1]
Annual base management fee, in percentage of stockholders' equity, in excess of recorded value of preferred stock     2.00%    
Base management fee 559,000 [1] 355,000 [1] 1,363,000 [1] 1,120,000 [1]  
Pre-incentive quarterly fee FFO in percentage of common stockholders equity that will reward the advisor     1.75%    
Pre-incentive annual fee FFO in percentage of common stockholders equity that will reward the advisor     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 1,138,000 [1] 927,000 [1] 3,001,000 [1] 2,614,000 [1]  
Credits related to unconditional and irrevocable voluntary waivers issued by the adviser 989,000 [1] 535,000 [1] 2,491,000 [1] 1,794,000 [1]  
Related-party transactions incentive fee, net 100,000 400,000 500,000 800,000  
Administration fee 274,000 [1] 272,000 [1] 1,004,000 [1] 846,000 [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 40,000   40,000    
Total secured mortgages subject to financing fee 52,400,000   52,400,000    
Financing fee on secured mortgages percentage     0.08%    
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 $ 60,000 $ 200,000 $ 100,000  
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"