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Real Estate and Intangible Assets - Summary Information of Farms Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended | 20 Months Ended | 25 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 09, 2017 USD ($) | Sep. 30, 2016 USD ($) a | Sep. 30, 2017 USD ($) a option lease farm | Sep. 30, 2016 USD ($) a option farm shares | Mar. 31, 2019 USD ($) | Aug. 30, 2019 USD ($) | Dec. 31, 2016 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of farms | farm |  |  | 72 | 56 |  |  |
Area leased (in acres) | a |  | 33,800 | 61,794 | 33,800 |  |  |
Farm acres (in acres) | a |  |  | 49,667 |  |  |  |
Net cost basis |  |  | $ 447,332,000 |  |  |  |
Capital expenditures |  |  | 3,438,000 | $ 10,126,000 |  |  |
Offering costs |  |  | $ 1,962,000 | $ 242,000 |  |  |
2017 New Real Estate Activity |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of farms | farm |  |  | 14 |  |  |  |
Area leased (in acres) | a |  |  | 11,202 |  |  |  |
Annualized straight-line cash rent |  |  | $ 6,692,000 |  |  |  |
2016 New Real Estate Activity |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of farms | farm |  |  |  | 13 |  |  |
Area leased (in acres) | a |  | 16,988 |  | 16,988 |  |  |
Annualized straight-line cash rent |  |  |  | $ 4,332,000 |  |  |
Direct leasing costs in connection with acquisitions |  | $ 128,000 |  | 229,000 |  |  |
2016 New Real Estate Activity | New Tenant Lease Agreement |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Direct leasing costs in connection with acquisitions |  |  |  | $ 9,520 |  |  |
Arizona |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of farms | farm |  |  | 6 | 2 |  |  |
Area leased (in acres) | a |  | 3,000 | 6,280 | 3,000 |  |  |
Farm acres (in acres) | a |  |  | 5,228 |  |  |  |
Net cost basis |  |  | $ 40,570,000 |  |  |  |
Arizona | 2017 New Real Estate Activity | In-place leases |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of leases | lease |  |  | 4 |  |  |  |
Arizona | 2017 New Real Estate Activity | In-place leases | Agricultural |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of leases | lease |  |  | 3 |  |  |  |
Arizona | State of Arizona |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Farm acres (in acres) | a |  |  | 1,221 |  |  |  |
Net cost basis |  |  | $ 3,300,000 |  |  |  |
Arizona | State of Arizona | 2017 New Real Estate Activity |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of farms | farm |  |  | 2 |  |  |  |
Area leased (in acres) | a |  |  | 1,368 |  |  |  |
Arizona | State of Arizona | State Lease 1 | 2017 New Real Estate Activity |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Area leased (in acres) | a |  |  | 485 |  |  |  |
Arizona | State of Arizona | State Lease 2 | 2017 New Real Estate Activity |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Area leased (in acres) | a |  |  | 883 |  |  |  |
Yuma, AZ | Spot Road | 2017 New Real Estate Activity |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of farms | farm |  |  | 4 |  |  |  |
Area leased (in acres) | a |  |  | 3,280 |  |  |  |
Annualized straight-line cash rent |  |  | $ 1,673,000 |  |  |  |
Yuma, AZ | Spot Road - Lease 1 | 2017 New Real Estate Activity | Agricultural |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Lease expiration date |  |  | Jun. 30, 2019 |  |  |  |
Yuma, AZ | Spot Road - Lease 2 | 2017 New Real Estate Activity | Agricultural |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Lease expiration date |  |  | Sep. 15, 2026 |  |  |  |
Yuma, AZ | Spot Road - Lease 3 | 2017 New Real Estate Activity | Agricultural |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Lease expiration date |  |  | Sep. 15, 2026 |  |  |  |
Yuma, AZ | Spot Road Lease 4 | 2017 New Real Estate Activity | Residential |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Lease expiration date |  |  | Sep. 30, 2019 |  |  |  |
Okeechobee, FL | Parrot Avenue(6) | 2017 New Real Estate Activity |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of farms | farm |  |  | 1 |  |  |  |
Area leased (in acres) | a |  |  | 1,910 |  |  |  |
Number of renewal options | option |  |  | 0 |  |  |  |
Annualized straight-line cash rent |  |  | $ 488,000 |  |  |  |
Okeechobee, FL | Parrot Avenue(6) | 2017 New Real Estate Activity | Forecast |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Capital expenditures |  |  |  |  | $ 1,000,000 |  |
Okeechobee, FL | Tenant Two | Parrot Avenue(6) | 2017 New Real Estate Activity |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Lease term | 6 years |  |  |  |  |  |
Number of renewal options | option |  |  | 2 |  |  |  |
Renewal term |  |  | 6 years |  |  |  |
Annualized straight-line cash rent | $ 542,000 |  |  |  |  |  |
Okeechobee, FL | Tenant One | Parrot Avenue(6) | 2017 New Real Estate Activity |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Lease term | 7 months |  |  |  |  |  |
Santa Barbara, CA | Cat Canyon Road(7) | 2017 New Real Estate Activity |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of farms | farm |  |  | 1 |  |  |  |
Area leased (in acres) | a |  |  | 361 |  |  |  |
Number of renewal options | option |  |  | 2 |  |  |  |
Renewal term |  |  | 5 years |  |  |  |
Annualized straight-line cash rent |  |  | $ 322,000 |  |  |  |
Santa Barbara, CA | Cat Canyon Road(7) | 2017 New Real Estate Activity | Forecast |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | $ 4,000,000 |
Saguache, CO | Gunbarrel Road | 2016 New Real Estate Activity |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of farms | farm |  |  |  | 3 |  |  |
Area leased (in acres) | a |  | 6,191 |  | 6,191 |  |  |
Lease term |  |  |  | 5 years |  |  |
Number of renewal options | option |  |  |  | 1 |  |  |
Renewal term |  |  |  | 5 years |  |  |
Annualized straight-line cash rent |  |  |  | $ 1,591,000 |  |  |
Units issued as partial consideration of acquisition (in shares) | shares |  |  |  | 745,879 |  |  |
Fair value of units issued as partial consideration of acquisition |  | $ 6,500,000 |  | $ 6,500,000 |  |  |
Offering costs |  |  |  | $ 25,500 |  |  |
Baca, CO | Baca County | 2016 New Real Estate Activity |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of farms | farm |  |  |  | 5 |  |  |
Area leased (in acres) | a |  | 7,384 |  | 7,384 |  |  |
Lease term |  |  |  | 4 years |  |  |
Number of renewal options | option |  |  |  | 1 |  |  |
Renewal term |  |  |  | 5 years |  |  |
Annualized straight-line cash rent |  |  |  | $ 384,000 |  |  |
Units issued as partial consideration of acquisition (in shares) | shares |  |  |  | 125,677 |  |  |
Fair value of units issued as partial consideration of acquisition |  | $ 1,500,000 |  | $ 1,500,000 |  |  |
Offering costs |  |  |  | $ 8,235 |  |  |
Stanislaus, CA | Diego Ranch | 2016 New Real Estate Activity |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Number of farms | farm |  |  |  | 1 |  |  |
Area leased (in acres) | a |  | 1,357 |  | 1,357 |  |  |
Lease term |  |  |  | 3 years |  |  |
Annualized straight-line cash rent |  |  |  | $ 621,000 |  |  |
Units issued as partial consideration of acquisition (in shares) | shares |  |  |  | 343,750 |  |  |
Fair value of units issued as partial consideration of acquisition |  | $ 3,900,000 |  | $ 3,900,000 |  |  |
Offering costs |  |  |  | $ 21,710 |  |  |
Mortgage notes and bonds payable |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Unamortized deferred financing costs |  |  | $ 1,902,000 |  |  |  | $ 1,412,000

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