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Commitments and Contingencies - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 12 Months Ended | 17 Months Ended | 19 Months Ended | 25 Months Ended | 44 Months Ended | 89 Months Ended |  |
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Jun. 01, 2017 farm | Jul. 31, 2018 USD ($) a | May 31, 2018 USD ($) | Aug. 31, 2017 USD ($) a | Jun. 30, 2017 farm | Mar. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) a | Dec. 31, 2017 USD ($) a | Dec. 31, 2018 USD ($) a | Dec. 31, 2018 USD ($) a | Jun. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2024 | Jun. 07, 2018 a | May 31, 2017 farm
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost |  |  |  |  |  |  |  | $ 22,605,000 | $ 5,211,000 |  |  |  |  |  |  |
Number of farms acquired | farm | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Acres | a |  |  |  |  |  |  |  | 73,205 | 63,014 | 73,205 | 73,205 |  |  |  |  |
2017 New Real Estate Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Acres | a |  |  |  |  |  |  |  |  | 12,641 |  |  |  |  |  |  |
2018 New Real Estate Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Acres | a |  |  |  |  |  |  |  | 12,114 |  | 12,114 | 12,114 |  |  |  |  |
Oregon |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms in lease amendment | farm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Accrued liabilities related to lease |  |  |  |  |  |  |  | $ 921,000 |  | $ 921,000 | $ 921,000 |  |  |  |  |
Total Acres | a |  |  |  |  |  |  |  | 418 | 2,313 | 418 | 418 |  |  |  |  |
Oregon | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 |  |  |
Annual rent escalation (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% |  |
Oregon | 2018 New Real Estate Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost |  |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Expended or accrued for capital improvements |  |  |  |  |  |  | $ 30,000 |  |  |  |  |  |  |  |  |
North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms acquired | farm |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Expended or accrued for capital improvements |  |  |  |  |  |  |  |  |  |  | $ 166,000 |  |  |  |  |
Total Acres | a |  |  |  |  |  |  |  | 310 | 310 | 310 | 310 |  |  |  |  |
North Carolina | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |
Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Acres | a |  |  |  |  |  |  |  | 17,184 | 11,006 | 17,184 | 17,184 |  |  |  | 26 |
Florida | 2017 New Real Estate Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expended or accrued for capital improvements |  |  |  |  |  | $ 748,000 |  |  |  |  |  |  |  |  |  |
Collier & Hendry, FL | 2018 New Real Estate Activity | Owl Hammock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Acres | a |  | 5,630 |  |  |  |  |  | 5,630 |  | 5,630 | 5,630 |  |  |  |  |
California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rent escalation (as percent) |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |
Expended or accrued for capital improvements |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |
Total Acres | a |  |  |  |  |  |  |  | 10,147 | 8,080 | 10,147 | 10,147 |  |  |  |  |
Santa Barbara, CA | 2017 New Real Estate Activity | Cat Canyon Road |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Total Acres | a |  |  |  | 361 |  |  |  |  | 361 |  |  |  |  |  |  |

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