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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Significant Accounting Policies [Line Items]        
Advisor fees on gross offering proceeds 1.00%   1.00%  
Offering proceeds $ 3,293   $ 3,225  
Cost incurred by advisor 4,392   4,190  
Cost reimbursed 34   32  
Mortgage indebtedness, carrying value 92,413   92,413 82,175
Taxable income distributable to stockholders 90.00%   90.00%  
Anti-dilutive shares outstanding   5,274,900 5,274,900 5,274,900
Mortgages
       
Significant Accounting Policies [Line Items]        
Mortgage indebtedness, fair value 96,557   95,827  
Mortgages | Adjustments [Member]
       
Significant Accounting Policies [Line Items]        
Mortgage indebtedness, fair value $ 95,827      
Building and Building Improvements
       
Significant Accounting Policies [Line Items]        
Useful life 40 years   40 years  
Equipment and fixtures | Minimum
       
Significant Accounting Policies [Line Items]        
Useful life 5 years   5 years  
Equipment and fixtures | Maximum
       
Significant Accounting Policies [Line Items]        
Useful life 10 years   10 years