Quarterly report pursuant to Section 13 or 15(d)

Mortgage Note Payable and Line of Credit - Summary of Mortgage Note Payable and Line of Credit (Detail)

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Mortgage Note Payable and Line of Credit - Summary of Mortgage Note Payable and Line of Credit (Detail) (USD $)
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
May 31, 2012
Debt Instrument [Line Items]      
Principal Outstanding $ 29,589,165 $ 30,817,880  
Remaining Availability 18,250,000 18,250,000  
Mortgage Note Payable [Member]
      
Debt Instrument [Line Items]      
Initial Commitment 29,489,165    
MetLife [Member] | Mortgage Note Payable [Member]
      
Debt Instrument [Line Items]      
Issuer MetLife    
Date of Issuance Dec. 30, 2010    
Initial Commitment 45,200,000    
Maturity Date Jan. 05, 2026    
Principal Outstanding 29,489,165 30,717,880  
Stated Interest Rate 3.50% 3.50%  
Remaining Availability 13,565,000 13,565,000  
MetLife [Member] | Line of Credit [Member]
      
Debt Instrument [Line Items]      
Issuer MetLife    
Date of Issuance May 31, 2012    
Initial Commitment 4,785,000   4,800,000
Maturity Date Apr. 05, 2017    
Principal Outstanding 100,000 100,000  
Stated Interest Rate 3.27% 3.35%  
Remaining Availability $ 4,685,000 $ 4,685,000