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Commitments and Contingencies - Additional Information (Detail) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 7 Months Ended | 9 Months Ended | 20 Months Ended | 25 Months Ended | 44 Months Ended | 61 Months Ended | 72 Months Ended | 89 Months Ended | 115 Months Ended | 118 Months Ended | 184 Months Ended |
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Aug. 31, 2017 a | Jun. 30, 2017 farm | Sep. 30, 2017 USD ($) a | Sep. 30, 2017 USD ($) a | Sep. 30, 2016 USD ($) a | Sep. 30, 2017 USD ($) a | Sep. 30, 2017 USD ($) a | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) a farm | Sep. 30, 2016 USD ($) a farm | Mar. 31, 2019 USD ($) | Aug. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2017 USD ($) a | Dec. 31, 2020 USD ($) | Jun. 30, 2022 USD ($) | Feb. 23, 2024 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2026 USD ($) | May 31, 2027 USD ($) | Jan. 09, 2031 USD ($) | May 31, 2017 farm
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost |  |  |  |  |  |  |  |  | $ 3,438,000 | $ 10,126,000 |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  | $ 6,561,000 | $ 4,467,000 |  |  |  | $ 18,302,000 | $ 12,388,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of farms acquired | farm |  |  |  |  |  |  |  |  | 0 | 6 |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in acres) | a |  |  | 61,794 | 61,794 | 33,800 | 61,794 | 61,794 |  | 61,794 | 33,800 |  |  |  | 61,794 |  |  |  |  |  |  |  |
2017 New Real Estate Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  | $ 1,500,000 |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in acres) | a |  |  | 11,202 | 11,202 |  | 11,202 | 11,202 |  | 11,202 |  |  |  |  | 11,202 |  |  |  |  |  |  |  |
Oregon |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms in lease amendment | farm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Rental revenue |  |  |  |  |  |  |  |  | $ 887,000 | $ 877,000 |  |  |  |  |  |  |  |  |  |  |  |
Expended or accrued for capital improvements |  |  |  | $ 78,000 |  |  | $ 677,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in acres) | a |  |  | 2,313 | 2,313 | 2,313 | 2,313 | 2,313 |  | 2,313 | 2,313 |  |  |  | 2,313 |  |  |  |  |  |  |  |
Oregon | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 |  |  |  |  |  |  |
Annual rent escalation (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 718,000 |  |  |  |
North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  | $ 42,000 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Expended or accrued for capital improvements |  |  |  |  |  | $ 103,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms acquired | farm |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years in lease term to provide additional support |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in acres) | a |  |  | 310 | 310 | 0 | 310 | 310 |  | 310 | 0 |  |  |  | 310 |  |  |  |  |  |  |  |
North Carolina | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 157,000 |  |  |
Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms in lease amendment | farm |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  | $ 4,839,000 | $ 2,408,000 |  |  |  |  |  |  |  |  |  |  |  |
Expended or accrued for capital improvements |  |  | $ 0 |  |  | $ 240,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in acres) | a | 1,910 |  | 11,225 | 11,225 | 5,567 | 11,225 | 11,225 |  | 11,225 | 5,567 |  |  |  | 11,225 |  |  |  |  |  |  |  |
Florida | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rent escalation (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.50% |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 280,000 | $ 300,000 |  |  |  |  |
Okeechobee, FL | 2017 New Real Estate Activity | Parrot Avenue(6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in acres) | a |  |  | 1,910 | 1,910 |  | 1,910 | 1,910 |  | 1,910 |  |  |  |  | 1,910 |  |  |  |  |  |  |  |
Okeechobee, FL | 2017 New Real Estate Activity | Forecast | Parrot Avenue(6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rent escalation (as percent) | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  | $ 8,749,000 | $ 6,986,000 |  |  |  |  |  |  |  |  |  |  |  |
Expended or accrued for capital improvements |  |  | $ 132,000 |  |  |  |  |  |  |  |  |  |  | $ 8,400,000 |  |  |  |  |  |  |  |
Number of years in lease term to provide additional support | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in acres) | a | 361 |  | 7,921 | 7,921 | 6,516 | 7,921 | 7,921 |  | 7,921 | 6,516 |  |  |  | 7,921 |  |  |  |  |  |  |  |
California | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300,000 | $ 5,200,000 |
Santa Barbara, CA | 2017 New Real Estate Activity | Cat Canyon Road(7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in acres) | a |  |  | 361 | 361 |  | 361 | 361 |  | 361 |  |  |  |  | 361 |  |  |  |  |  |  |  |
Santa Barbara, CA | 2017 New Real Estate Activity | Forecast | Cat Canyon Road(7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |

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