Annual report pursuant to Section 13 and 15(d)

Real Estate and Intangible Assets - Summarizes Lease Expirations by Year for Properties with Leases (Detail)

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Real Estate and Intangible Assets - Summarizes Lease Expirations by Year for Properties with Leases (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
acre
Lease
Dec. 31, 2012
Dec. 31, 2011
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 15    
Expiring Leased Acreage 5,991    
% of Total Acreage 100.00%    
Rental Revenue for the Year Ended December 31, 2013 $ 4,027,687 $ 3,390,594 $ 2,964,082
% of Total Rental Revenue 100.00%    
2014 [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 3    
Expiring Leased Acreage 504    
% of Total Acreage 8.40%    
Rental Revenue for the Year Ended December 31, 2013 889,955    
% of Total Rental Revenue 22.10%    
2015 [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 1    
Expiring Leased Acreage 72    
% of Total Acreage 1.20%    
Rental Revenue for the Year Ended December 31, 2013 142,500    
% of Total Rental Revenue 3.50%    
2016 [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 1    
Expiring Leased Acreage 59    
% of Total Acreage 1.00%    
Rental Revenue for the Year Ended December 31, 2013 68,335    
% of Total Rental Revenue 1.70%    
2017 [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 1    
Expiring Leased Acreage 124    
% of Total Acreage 2.10%    
Rental Revenue for the Year Ended December 31, 2013 241,811    
% of Total Rental Revenue 6.00%    
2018 [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 2    
Expiring Leased Acreage 369    
% of Total Acreage 6.10%    
Rental Revenue for the Year Ended December 31, 2013 164,173    
% of Total Rental Revenue 4.10%    
Thereafter [Member]
      
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 7    
Expiring Leased Acreage 4,863    
% of Total Acreage 81.20%    
Rental Revenue for the Year Ended December 31, 2013 $ 2,520,913    
% of Total Rental Revenue 62.60%