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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Related Party Transaction [Line Items] |  |  |  |
Base management fee | $ 862 | $ 690 | $ 2,741 | $ 2,102
Capital gains fee | 0 | 778 | 0 | 778
Credits to fees from Adviser | 0 | (796) | (1,542) | (970)
Total fees to our Adviser, net | 862 | 672 | 1,199 | 1,910
Administration fee | 311 | 387 | 866 | 935
Selling commissions and dealer-manager fees | 1,657 | 890 | 4,781 | 940
Financing fees | 160 | 57 | 188 | 59
Total fees to Gladstone Securities | $ 1,817 | 947 | $ 4,969 | 999
Selling commissions and dealer-manager fees, paid to third parties to date, percentage | 93.90% |  | 93.90% |
Taxable REIT Subsidiary |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Administration fee |  | 18 |  | 48
Gladstone Securities |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Administration fee | $ 160 | 57 | $ 188 | 59
Financing fee (as percent) |  |  | 0.14% |
Land Advisers | Taxable REIT Subsidiary |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Base management fee |  | $ 15 |  | $ 176

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- Definition Administration fee. + References No definition available. + Details
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- Definition Capital Gains Fee + 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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Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Management Fees and Financing Fees + References No definition available. + Details
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- Definition Percentage Of Financing Fee To Amount Of Mortgage + References No definition available. + Details
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Namespace Prefix: | land_
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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 Selling Commissions and Dealer-Manager Fees + References No definition available. + Details
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Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Selling Commissions and Dealer-Manager Fees, Paid To Third Parties To Date, Percentage + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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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- Details
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