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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
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |
Base management fee | $ 3,623 | $ 2,837
Incentive fee | 847 | 0
Capital gains fee | 0 | 628
Credits to fees from Adviser | (1,543) | (1,014)
Total fees to our Adviser, net | 2,927 | 2,451
Administration fee | 1,207 | 1,275
Payment of management fees | 7,645 | 2,324
Financing fee | 235 | 83
Total fees to Gladstone Securities | 7,880 | 2,407
Taxable REIT Subsidiary |  |
Related Party Transaction [Line Items] |  |
Administration fee | 57 | 57
Land Advisers | Taxable REIT Subsidiary |  |
Related Party Transaction [Line Items] |  |
Base management fee | 176 | 176
Gladstone Securities |  |
Related Party Transaction [Line Items] |  |
Financing fee | $ 235 | $ 83
Financing fee (as percent) | 0.14% |

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

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

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

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- Definition Percentage Of Financing Fee To Amount Of Mortgage + References No definition available. + Details
Name: | land_PercentageOfFinancingFeeToAmountOfMortgage
Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Related party transaction net incentive fees paid and credits received. + References No definition available. + Details
Name: | land_RelatedPartyTransactionNetIncentiveFeesPaidAndCreditsReceived
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Selling Commissions and Dealer-Manager Fees + References No definition available. + Details
Name: | land_SellingCommissionsandDealerManagerFees
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
Name: | us-gaap_IncentiveFeeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Name: | us-gaap_ManagementFeeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=land_TaxableREITSubsidiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=land_GladstoneLandAdvisersIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |