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 ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
MetLife Mortgage Notes Payable [Member]      
Debt Instrument [Line Items]      
Remaining availability   $ 2,000,000 $ 13,800,000
Metlife Line of Credit [Member]      
Debt Instrument [Line Items]      
Remaining availability   $ 2,000,000 $ 13,800,000
Farm Credit Mortgage Notes Payable [Member]      
Debt Instrument [Line Items]      
Reduced stated interest rate 12.70% 12.70% 12.70%
Farmer Mac Bonds Payable [Member]      
Debt Instrument [Line Items]      
Remaining availability   $ 0 $ 0