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Real Estate and Intangible Assets - Additional Information (Detail) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 25 Months Ended | 61 Months Ended | 72 Months Ended | 118 Months Ended | 184 Months Ended |  |
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Sep. 30, 2015 a well | Sep. 30, 2017 USD ($) a | Sep. 30, 2017 USD ($) a | Sep. 30, 2016 USD ($) a | Sep. 30, 2017 USD ($) a | Sep. 30, 2017 USD ($) a tenant region lease transaction farm | Sep. 30, 2016 USD ($) a transaction farm | Sep. 30, 2017 USD ($) a | Jun. 30, 2022 USD ($) | Feb. 23, 2024 USD ($) | May 31, 2027 USD ($) | Jan. 09, 2031 USD ($) | Aug. 31, 2017 a | Dec. 31, 2016 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  | 72 | 56 |  |  |  |  |  |  |
Depreciation expense |  |  | $ 1,700,000 | $ 1,200,000 |  | $ 4,400,000 | $ 3,200,000 |  |  |  |  |  |  |
Tenant improvements, net of depreciation |  | $ 2,200,000 | 2,200,000 |  | $ 2,200,000 | 2,200,000 |  | $ 2,200,000 |  |  |  |  |  | $ 1,800,000
Tenant improvements, depreciation and rental revenue |  |  | 61,000 | 31,000 |  | 150,000 | 98,000 |  |  |  |  |  |  |
Amortization expense related to intangible assets |  |  | 390,000 | 207,000 |  | 739,000 | 582,000 |  |  |  |  |  |  |
Amortization of acquired above market lease values and deferred revenue |  |  | 4,000 | 2,000 |  | 7,000 | 5,000 |  |  |  |  |  |  |
Total accretion related to below-market lease values and deferred revenue |  |  | 17,000 | 9,000 |  | 47,000 | 24,000 |  |  |  |  |  |  |
Rental revenue |  |  | $ 6,561,000 | $ 4,467,000 |  | $ 18,302,000 | $ 12,388,000 |  |  |  |  |  |  |
Number of farms acquired | farm |  |  |  |  |  | 0 | 6 |  |  |  |  |  |  |
Area leased (in acres) | a |  | 61,794 | 61,794 | 33,800 | 61,794 | 61,794 | 33,800 | 61,794 |  |  |  |  |  |
Number of tenants | tenant |  |  |  |  |  | 49 |  |  |  |  |  |  |  |
Percent of rental revenue (as percent) |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |
Tenant A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  | 5 |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  | $ 3,200,000 |  |  |  |  |  |  |  |
Percent of rental revenue (as percent) |  |  |  |  |  | 17.70% |  |  |  |  |  |  |  |
Dole Food Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  | $ 2,200,000 |  |  |  |  |  |  |  |
Percent of rental revenue (as percent) |  |  |  |  |  | 12.20% |  |  |  |  |  |  |  |
California and Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  | $ 2,018 |  |  |  |  |  |  |  |
Number of extended or renewed leases | lease |  |  |  |  |  | 10 |  |  |  |  |  |  |  |
Number of farms with extended or renewed leases | farm |  |  |  |  |  | 9 |  |  |  |  |  |  |  |
Payments for Tenant Improvements |  |  |  |  |  | $ 2,017 |  |  |  |  |  |  |  |
Annualized straight-line cash rent |  |  |  |  |  | 2,200,000 |  |  |  |  |  |  |  |
Decrease in rental income |  |  |  |  |  | $ 167,000 |  |  |  |  |  |  |  |
Decrease in rental revenue (as percent) |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |
California and Florida | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewal term |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
California and Florida | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewal term |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
California |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  | 27 | 21 |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  | $ 8,749,000 | $ 6,986,000 |  |  |  |  |  |  |
Area leased (in acres) | a |  | 7,921 | 7,921 | 6,516 | 7,921 | 7,921 | 6,516 | 7,921 |  |  |  |  | 361 |
Removal area of old grape vineyards (in acres) | a | 274 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new drilling wells | well | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Area of new almond trees (in acres) | a | 800 |  |  |  |  |  |  |  |  |  |  |  |  |
Expended or accrued for capital improvements |  | $ 132,000 |  |  |  |  |  | $ 8,400,000 |  |  |  |  |  |
Percent of rental revenue (as percent) |  |  |  |  |  | 47.80% | 56.40% |  |  |  |  |  |  |
Number of regions farms are located | region |  |  |  |  |  | 4 |  |  |  |  |  |  |  |
California | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  |  |  | $ 2,300,000 | $ 5,200,000 |  |
Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  | 17 | 15 |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  | $ 4,839,000 | $ 2,408,000 |  |  |  |  |  |  |
Area leased (in acres) | a |  | 11,225 | 11,225 | 5,567 | 11,225 | 11,225 | 5,567 | 11,225 |  |  |  |  | 1,910 |
Expended or accrued for capital improvements |  | $ 0 |  |  | $ 240,000 |  |  |  |  |  |  |  |  |
Percent of rental revenue (as percent) |  |  |  |  |  | 26.50% | 19.40% |  |  |  |  |  |  |
Florida | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  |  |  |  | $ 280,000 | $ 300,000 |  |  |  |
Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  | 9 | 8 |  |  |  |  |  |  |
Rental revenue |  |  |  |  |  | $ 2,018,000 | $ 951,000 |  |  |  |  |  |  |
Area leased (in acres) | a |  | 30,170 | 30,170 | 13,575 | 30,170 | 30,170 | 13,575 | 30,170 |  |  |  |  |  |
Percent of rental revenue (as percent) |  |  |  |  |  | 11.00% | 7.70% |  |  |  |  |  |  |
2017 New Real Estate Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  | 14 |  |  |  |  |  |  |  |
Number of transactions | transaction |  |  |  |  |  | 7 |  |  |  |  |  |  |  |
Rental revenue |  |  | $ 1,500,000 |  |  | $ 3,000,000 |  |  |  |  |  |  |  |
Earnings (loss) recognized |  |  | $ 341,000 |  |  | $ 1,200,000 |  |  |  |  |  |  |  |
Area leased (in acres) | a |  | 11,202 | 11,202 |  | 11,202 | 11,202 |  | 11,202 |  |  |  |  |  |
2016 New Real Estate Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of farms | farm |  |  |  |  |  |  | 13 |  |  |  |  |  |  |
Number of transactions | transaction |  |  |  |  |  |  | 7 |  |  |  |  |  |  |
Rental revenue |  |  |  | $ 770,000 |  |  | $ 1,500,000 |  |  |  |  |  |  |
Earnings (loss) recognized |  |  |  | (42,000) |  |  | (196,000) |  |  |  |  |  |  |
Non-recurring acquisition-related costs |  |  |  | $ 128,000 |  |  | $ 229,000 |  |  |  |  |  |  |
Area leased (in acres) | a |  |  |  | 16,988 |  |  | 16,988 |  |  |  |  |  |  |
2015 New Real Estate Activity | California |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area leased (in acres) | a |  | 854 | 854 |  | 854 | 854 |  | 854 |  |  |  |  |  |

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