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Related-Party Transactions - Additional Information (Detail) |  |  | 3 Months Ended | 8 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 10, 2018 | Apr. 01, 2017 | Dec. 31, 2018 USD ($) a | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) a officer | Dec. 31, 2017 USD ($) a | Jun. 11, 2018 a | Oct. 17, 2017 USD ($) a
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of executive officers that serve as directors | officer |  |  |  |  | 2 |  |  |
Management fee (as percent) |  | 2.00% |  |  | 2.00% |  |  |
Hurdle rate, quarterly (as percent) |  | 1.75% |  |  | 1.75% |  |  |
Hurdle rate, annual (as percent) |  | 7.00% |  |  | 7.00% |  |  |
Pre-incentive Fee FFO (as percent) |  | 100.00% |  |  | 100.00% |  |  |
Pre-Incentive Fee, exceeded (as percent) |  | 2.1875% |  |  | 2.1875% |  |  |
Pre-Incentive Fee, exceeded, annual (as percent) |  | 8.75% |  |  | 8.75% |  |  |
Pre-Incentive Fee (as percent) |  | 20.00% |  |  | 20.00% |  |  |
Base management fee, quarterly (as percent) |  | 0.50% |  |  |  |  |  |
Base management fee, waiver credit granted by Adviser |  |  |  |  | $ 46,000 |  |  |
Cumulative realized capital gains (as percent) |  | 15.00% |  |  |  |  |  |
Capital gains fee |  |  |  |  | 628,000 | $ 0 |  |
Capital gains fee, waiver credit granted by Adviser |  |  |  |  | $ 778,000 |  |  |
Capital gains fee, reduction of fee due to capital losses |  |  | $ 150,000 |  |  |  |  |
Written notice (in days) |  | 120 days |  |  |  |  |  |
Total Acres | a |  |  | 73,205 |  | 73,205 | 63,014 |  |
Base management fee |  |  |  |  | $ 2,837,000 | $ 2,041,000 |  |
Crop inventory |  |  | $ 0.0 |  | 0.0 | 1,528,000 |  |
Administration fee |  |  |  |  | 1,275,000 | 914,000 |  |
Financing fee |  |  |  |  | 83,000 | 36,000 |  |
Payment of management fees |  |  |  |  |  | 0 |  |
Gladstone Securities |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Payment of management fees |  |  |  |  | $ 2,200,000 |  |  |
Unsecured Debt | Land Advisers |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 1,700,000
Interest rate (as percent) |  |  |  |  |  |  |  | 5.00%
Affiliate |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Financing fee (as percent) |  |  |  |  | 0.12% |  |  |
Taxable REIT Subsidiary |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Professional fees |  |  |  | $ 207,000 | $ 136,000 | 71,000 |  |
Base management fee |  |  |  |  | 176,000 |  |  |
Allocation of overhead costs |  |  |  |  | 31,000 |  |  |
Fee waiver granted |  |  |  |  | 190,000 |  |  |
Administration fee |  |  |  |  | 57,000 | $ 22,000 |  |
Taxable REIT Subsidiary | Land Advisers |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Base management fee |  |  |  |  | 176,000 |  |  |
Preferred Stock | Series B Preferred Stock |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Selling commission fee (as percent) | 7.00% |  |  |  |  |  |  |
Dealer-manager fee (as percent) | 3.00% |  |  |  |  |  |  |
Payment of management fees |  |  |  |  | $ 2,324,000 |  |  |
Ventura County, California |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Total Acres | a |  |  |  |  |  |  | 169 | 169
Operating lease, term (in years) |  |  |  |  |  |  | 10 years |
Gladstone Securities | Minimum | Affiliate |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Financing fee (as percent) |  |  |  |  | 0.50% |  |  |
Gladstone Securities | Maximum | Affiliate |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Financing fee (as percent) |  |  |  |  | 1.00% |  |  |

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