Quarterly report pursuant to Section 13 or 15(d)

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

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Borrowings - Summary of Mortgage Note Payable and Line of Credit (Parenthetical) (Detail) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
MetLife [Member] | Mortgage Note Payable [Member]    
Debt Instrument [Line Items]    
Remaining availability $ 16,500,000 $ 13,800,000
MetLife [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Remaining availability $ 16,500,000 $ 13,800,000
Farm Credit Loan Maturing in May 2030 [Member] | Mortgage Notes Payable [Member]    
Debt Instrument [Line Items]    
Reduced stated interest rate 12.70% 12.70%
Farmer Mac [Member] | Bond Payable [Member]    
Debt Instrument [Line Items]    
Remaining availability $ 0 $ 0