Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions - Additional Information (Detail)

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Related-Party Transactions - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Related Party Transaction [Line Items]      
Due to Adviser and Administrator $ 1,360,000 [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 2,014,000 [1] 1,467,000 [1] 1,629,000 [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 4,201,000 [1] 3,569,000 [1] 3,398,000 [1]
Credits related to unconditional and irrevocable voluntary waivers issued by the Adviser 3,457,000 [1] 2,221,000 [1] 2,113,000 [1]
Related-party transactions incentive fee, net 700,000 1,400,000 1,300,000
Administration fee 1,467,000 [1] 1,118,000 [1] 1,024,000 [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 100,000    
Total secured mortgages subject to financing fee 76,300,000    
Financing fee on secured mortgages percentage 0.18%    
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 $ 200,000 $ 5,000
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"