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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Related Party Transactions [Abstract] |  |
Base management fee | $ 4,289 | $ 3,623
Incentive fee | 3,038 | 847
Capital gains fee | 0 | 0
Credits from non-contractual, unconditional, and irrevocable waiver granted by Adviser's board of directors | 0 | (1,543)
Total fees to our Adviser, net | 7,327 | 2,927
Administration fee | 1,448 | 1,207
Selling Commissions and Dealer-Manager Fees | 4,711 | 7,645
Financing fees | 262 | 235
Total fees to Gladstone Securities | $ 4,973 | $ 7,880

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- Definition Administration fee. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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

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- Definition Credits to fees from adviser. + References No definition available. + Details
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Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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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Balance Type: | debit
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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 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://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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Balance Type: | debit
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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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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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