| 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 | ||||||||||||||