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Borrowings - Summary of Mortgage Note Payable and Line of Credit Additional Information (Detail) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
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Sep. 08, 2017 USD ($) | Aug. 09, 2017 USD ($) | Jul. 17, 2017 USD ($) | Jul. 13, 2017 USD ($) | Jun. 14, 2017 USD ($) | May 31, 2017 USD ($) debt_instrument | Apr. 30, 2017 USD ($) | Feb. 28, 2017 USD ($) | Jan. 31, 2017 | Mar. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) debt_instrument property | Mar. 31, 2017 | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) debt_instrument property | Sep. 30, 2016 USD ($) | Sep. 19, 2017 | Jan. 12, 2017 USD ($) | Jun. 16, 2016 USD ($) | Dec. 05, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  | $ 4,000 |  | $ 2,000 | $ 190,000 | $ 106,000 |  |  |  |
New MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  | $ 136,310,000 |  |  | $ 136,310,000 |  |  |  |  |
Commitment fee (as percent) |  |  |  |  |  |  |  |  |  |  | 0.20% |  |  | 0.20% |  |  |  |  |
Long-term debt, additional amount available |  |  |  |  |  |  |  |  |  |  | $ 12,900,000 |  |  | $ 12,900,000 |  |  |  |  |
Minimum annualized rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |
Farm Credit Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  |  |  | 14 |  |  | 14 |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  | $ 61,107,000 |  |  | $ 61,107,000 |  |  |  |  |
Reduced stated interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.20% |  |  |  |  |
Reduction in basis points (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.61% |  |  |  |  |
Farm Credit CFL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  |  | $ 5,472,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  |  | 28 years 4 months 14 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  |  |  | 8 |  |  | 8 |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  | $ 27,472,000 |  |  | $ 27,472,000 |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  |  |  |  |  |  | 4.15% |  |  | 4.15% |  |  |  |  |
Interest rate (as percent) |  |  |  | 4.47% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans with amended agreements | debt_instrument |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  | $ 124,000 |  |  | $ 94,000 |  |  |  |  |  |  |  |  |
Reduced stated interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  | 15.80% |  |  |  |  |  |  |
Reduction in basis points (as percent) |  |  |  |  |  |  |  |  |  |  | 0.55% |  |  |  |  |  |  |  |
Farm Credit West |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  | $ 8,162,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  |  |  | 3 |  |  | 3 |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  | $ 21,054,000 |  |  | $ 21,054,000 |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  |  |  |  |  |  | 3.91% |  |  | 3.91% |  |  |  |  |
Interest rate (as percent) |  |  | 4.31% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  | $ 59,000 |  |  |  |  | $ 0 |  |  |  |  |  |
Reduced stated interest rate (as percent) |  |  |  |  |  |  |  |  | 21.30% |  |  |  |  |  |  |  |  |  |
Reduction in basis points (as percent) |  |  |  |  |  |  |  |  |  |  |  | 0.76% |  |  |  |  |  |  |
CF Farm Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  |  |  | $ 1,301,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  |  |  | 40 years 2 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  |  |  | 1 |  |  | 1 |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  | $ 1,301,000 |  |  | $ 1,301,000 |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  |  |  |  |  |  | 4.41% |  |  | 4.41% |  |  |  |  |
Farm Credit FL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  | $ 5,820,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  | 19 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  |  |  | 1 |  |  | 1 |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  | $ 5,820,000 |  |  | $ 5,820,000 |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  |  |  |  |  |  | 4.70% |  |  | 4.70% |  |  |  |  |
NW Farm Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment | $ 5,460,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term | 39 years 7 months 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  |  |  | 1 |  |  | 1 |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  | $ 5,460,000 |  |  | $ 5,460,000 |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  |  |  |  |  |  | 4.41% |  |  | 4.41% |  |  |  |  |
Farmer Mac Bonds Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |  | $ 125,000,000 |  |  |  | $ 125,000,000 | $ 75,000,000
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  |  |  | 14 |  |  | 14 |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  | $ 84,519,000 |  |  | $ 84,519,000 |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  |  |  |  |  |  | 3.13% |  |  | 3.13% |  |  |  |  |
Undrawn Commitment |  |  |  |  |  |  |  |  |  |  | $ 39,118,000 |  |  | $ 39,118,000 |  |  |  |  |
Long-term debt, additional amount available |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  |  |  |
Properties pledged as collateral | property |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |
Farmer Mac Bonds Payable, 2017 Issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,625,000 |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  |  |  |  |  |  | 5 |  |  | 5 |  |  |  |  |
Farmer Mac Bonds Payable, 2017 Issuances | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.80% |  |
Farmer Mac Bonds Payable, 2017 Issuances | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.05% |  |
Notes payable to bank | Metlife Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  |  |  |  | $ 15,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  |  |  |  |  | 28 years 7 months |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Loans Outstanding | debt_instrument |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.85% |  |  |
Notes payable to bank | Metlife Term Loans | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  | 3.55% |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to bank | Metlife Term Loans | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  | 3.85% |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to bank | New MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  | $ 150,000,000 |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  | $ 131,210,000 |  |  | $ 131,210,000 |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  |  |  |  |  |  | 3.30% |  |  | 3.30% |  |  |  |  |
Undrawn Commitment |  |  |  |  |  |  |  |  |  |  | $ 13,530,000 |  |  | $ 13,530,000 |  |  |  |  |
Amortizing principal payments |  |  |  |  |  |  |  |  |  |  | 5,300,000 |  |  | 5,300,000 |  |  |  |  |
Notes payable to bank | CF Farm Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as percent) |  |  |  |  | 4.41% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to bank | Farm Credit FL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as percent) |  | 4.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to bank | NW Farm Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as percent) | 4.41% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MetLife Lines of Credit | New MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Commitment |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  | 50,000,000 |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  | 5,100,000 |  |  | 5,100,000 |  |  |  |  |
Undrawn Commitment |  |  |  |  |  |  |  |  |  |  | $ 44,900,000 |  |  | $ 44,900,000 |  |  |  |  |
Effective interest rate (as percent) |  |  |  |  |  |  |  |  |  |  | 3.55% |  |  | 3.55% |  |  |  |  |
MetLife Lines of Credit | New MetLife Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage added to LIBOR (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |

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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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