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Borrowings - Summary of Mortgage Note Payable and Line of Credit Additional Information (Detail) |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 30, 2018 USD ($) | Apr. 11, 2018 USD ($) | Oct. 13, 2017 USD ($) | May 31, 2017 USD ($) debt_instrument | Apr. 30, 2018 USD ($) | Feb. 28, 2018 USD ($) | Apr. 30, 2017 USD ($) | Feb. 28, 2017 USD ($) | Jun. 30, 2018 USD ($) debt_instrument property | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) debt_instrument property | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Aug. 08, 2018 USD ($) | Jul. 12, 2018 | Mar. 13, 2018 USD ($) | Dec. 05, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | $ 9,000 | $ 0 | $ 323,000 | $ 185,000 |  |  |  |  |
Rabo AgriFinance, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  | $ 518,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) |  |  | 4.59% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amortization |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
New MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  | 132,414,000 |  | 132,414,000 |  |  |  |  |  |
Long-term debt, additional amount available |  |  |  |  |  |  |  |  | $ 16,900,000 |  | $ 16,900,000 |  |  |  |  |  |
Minimum annualized rate (as percent) |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |
New MetLife Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee (as percent) |  |  |  |  |  |  |  |  | 0.10% |  | 0.10% |  |  |  |  |  |
Unused fee, percentage |  |  |  |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |
New MetLife Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee (as percent) |  |  |  |  |  |  |  |  | 0.20% |  | 0.20% |  |  |  |  |  |
Unused fee, percentage |  |  |  |  |  |  |  |  |  |  | 0.20% |  |  |  |  |  |
Farm Credit Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  | $ 61,928,000 |  | $ 61,928,000 |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  | 15 |  | 15 |  |  |  |  |  |
Reduction in basis points (as percent) |  |  |  |  |  |  |  |  |  |  | 0.71% |  |  |  |  |  |
Farm Credit CFL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  | $ 24,274,000 |  | $ 24,274,000 |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  |  |  | 4.29% |  | 4.29% |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  | 7 |  | 7 |  |  |  |  |  |
Other income |  |  |  |  | $ 142,000 |  | $ 124,000 |  |  |  |  |  |  |  |  |  |
Reduced stated interest rate (as percent) |  |  |  |  | 15.10% |  |  |  |  |  | 18.00% |  |  |  |  |  |
Reduction in basis points (as percent) |  |  |  |  | 0.58% |  |  |  |  |  |  |  |  |  |  |  |
Farm Credit West |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  | $ 1,473,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  | $ 25,332,000 |  | $ 25,332,000 |  |  |  |  |  |
Stated interest rate (as percent) |  | 4.99% |  |  |  |  |  |  | 4.08% |  | 4.08% |  |  |  |  |  |
Principal Amortization |  | 20 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  | 5 |  | 5 |  |  |  |  |  |
Other income |  |  |  |  | $ 11,000 | $ 126,000 |  | $ 59,000 |  |  |  |  |  |  |  |  |
Reduced stated interest rate (as percent) |  |  |  |  | 36.60% | 19.70% |  |  |  |  |  |  |  |  |  |  |
Reduction in basis points (as percent) |  |  |  |  |  | 0.75% |  |  |  |  |  |  |  |  |  |  |
CF Farm Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  | $ 1,270,000 |  | $ 1,270,000 |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  |  |  | 4.41% |  | 4.41% |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Reduction in basis points (as percent) |  |  |  |  | 1.61% |  |  |  |  |  |  |  |  |  |  |  |
Farm Credit FL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  | $ 5,727,000 |  | $ 5,727,000 |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  |  |  | 4.70% |  | 4.70% |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |  |  |  |
Other income |  |  |  |  | $ 27,000 |  |  |  |  |  |  |  | 0 |  |  |  |
Reduced stated interest rate (as percent) |  |  |  |  | 24.60% |  |  |  |  |  |  |  |  |  |  |  |
Reduction in basis points (as percent) |  |  |  |  | 1.15% |  |  |  |  |  |  |  |  |  |  |  |
NW Farm Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  | $ 5,325,000 |  | $ 5,325,000 |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  |  |  | 4.41% |  | 4.41% |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |  |  |  |
Other income |  |  |  |  |  | $ 17,000 |  |  |  |  |  |  | $ 0 |  |  |  |
Reduced stated interest rate (as percent) |  |  |  |  |  | 22.70% |  |  |  |  |  |  |  |  |  |  |
Reduction in basis points (as percent) |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Farmer Mac Bonds Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 | $ 125,000,000
Principal Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,551,000 |
Interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.15% |
Undrawn Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,858,000 |
Long-term debt, additional amount available |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  |  |  | 2.60% |  | 2.60% |  |  |  |  |  |
Principal Amortization |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  | 15 |  | 15 |  |  |  |  |  |
Properties pledged as collateral | property |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |
Farmer Mac Bonds Payable, 2017 Issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,260,000 |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |  |  |  |
Farmer Mac Bonds Payable, 2017 Issuances | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.47% |
Notes payable to bank | New MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  |  |  |  |  |  |  | $ 200,000,000 |  | $ 200,000,000 |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  | $ 128,914,000 |  | $ 128,914,000 |  |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  |  |  |  | 3.30% |  | 3.30% |  |  |  |  |  |
Undrawn Commitment |  |  |  |  |  |  |  |  | $ 63,530,000 |  | $ 63,530,000 |  |  |  |  |  |
Amortizing principal payments |  |  |  |  |  |  |  |  | 7,600,000 |  | 7,600,000 |  |  |  |  |  |
Notes payable to bank | Metlife Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  |  | $ 15,032,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amortization |  |  |  | 28 years 7 months |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to bank | Metlife Term Loans | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  | 3.55% |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to bank | Metlife Term Loans | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  | 3.85% |  |  |  |  |  |  |  |  |  |  |  |  |
MetLife Lines of Credit | New MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  |  |  |  |  |  |  | 75,000,000 |  | 75,000,000 |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  | 3,500,000 |  | 3,500,000 |  |  |  |  |  |
Undrawn Commitment |  |  |  |  |  |  |  |  | $ 71,500,000 |  | $ 71,500,000 |  |  |  |  |  |
Effective interest rate (as percent) |  |  |  |  |  |  |  |  | 4.57% |  | 4.57% |  |  |  |  |  |
MetLife Lines of Credit | New MetLife Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage added to LIBOR (as percent) |  |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |
Subsequent event | Farm Credit FL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.38% |  |
Subsequent event | Farmer Mac Bonds Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment | $ 10,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,400,000 |  |  |
Stated interest rate (as percent) | 4.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amortization | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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