Quarterly report pursuant to Section 13 or 15(d)

Mortgage Note Payable and Line of Credit - Additional Information (Detail)

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Mortgage Note Payable and Line of Credit - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
MetLife [Member]
Sep. 30, 2013
Agrifinance [Member]
Nov. 30, 2002
Agrifinance [Member]
Sep. 30, 2013
Mortgage Note Payable [Member]
Dec. 31, 2012
Mortgage Note Payable [Member]
MetLife [Member]
Disbursement
Dec. 31, 2011
Mortgage Note Payable [Member]
MetLife [Member]
Disbursement
Sep. 30, 2013
Mortgage Note Payable [Member]
MetLife [Member]
Adjustment_Date
Disbursement
Jan. 05, 2012
Mortgage Note Payable [Member]
MetLife [Member]
Sep. 30, 2013
Mortgage Note Payable [Member]
MetLife [Member]
Maximum [Member]
Sep. 30, 2013
Line of Credit [Member]
MetLife [Member]
May 31, 2012
Line of Credit [Member]
MetLife [Member]
Debt Instrument [Line Items]                                  
Weighted average interest rate on borrowings 3.63% 3.68%   3.63% 3.67%                        
Amount borrowed into a long-term note payable                   $ 29,489,165     $ 45,200,000   $ 45,200,000 $ 4,785,000 $ 4,800,000
Initial accrued interest rate                         3.50%        
Maturity Date                         Jan. 05, 2026     Apr. 05, 2017  
Number of interest rate adjustments date                         4        
Number of Disbursements                       3          
Number of additional disbursements                     3            
Disbursements drawn prior to the December 2012 amendment                     2            
Commitment fee on undrawn amount                           0.20%      
Maximum number of disbursement after amendment under loan agreement                     3            
Number of disbursement drawn after amendment drawn to date under loan agreement                     0            
Period for rate adjustment                         3 years        
Interest rate adjustment date                         Jan. 05, 2014        
Outstanding under loan 29,489,165     29,489,165   30,717,880             29,500,000        
Number of remaining disbursements                         3        
Maximum amount under the remaining three disbursements                         13,600,000        
Due date for acquisition of new property from funds             Dec. 14, 2013                    
Fair market value of the mortgage note payable                         30,100,000        
Revolving line of credit facility                 3,300,000                
Credit facility maturity     May 31, 2012         Dec. 01, 2017                  
Interest rate charged       three-month LIBOR plus 3.00%                          
Minimum annualized rate       3.25%                          
Carrying values of our lines of credit 100,000     100,000   100,000                      
Availability of credit facility $ 4,700,000     $ 4,700,000   $ 4,700,000