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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |  |
Management fee | $ 754 | $ 530 | $ 1,411 | $ 924 |
Incentive fee | 0 | 76 | 0 | 427 |
Credits to fees from Adviser | (174) | 0 | (174) | 0 |
Total fees to our Adviser | 580 | 606 | 1,237 | 1,351 |
Administration fee | 275 | 219 | 549 | 445 |
Financing Fees to Gladstone Securities | 2 | 2 | 2 | 2 |
Deferred management fees |  |  |  |  | $ 193
Crop inventory | 0 |  | 0 |  | $ 1,528
Taxable REIT Subsidiary |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Management fee | 94 |  | 161 |  |
Administration fee | 17 |  | 30 |  |
Deferred management fees | 28 |  | 28 |  |
Preferred Stock | Series B Preferred Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Management fee | $ 50 | $ 0 | $ 50 | $ 0 |

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- Definition Administration fee. + References No definition available. + Details
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- Definition Agricultural Related Inventory, Overhead Costs + References No definition available. + Details
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- Definition Credits to fees from adviser. + References No definition available. + Details
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- Definition Financing Fee + References No definition available. + Details
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- Definition Related party transaction net incentive fees paid and credits received. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of merchandise or supplies held which are related to plants and animals. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of expense for incentive rights held by the managing member or general partner, of limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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