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v3.19.1

Business - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2019
Maryland |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Company re-incorporated date | Mar. 24, 2011
Land Advisers |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Company's ownership percent (as percent) | 100.00%

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- Definition Date of reincorporation. + References No definition available. + Details
Name: | land_DateOfReincorporation
Namespace Prefix: | land_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Organization consolidation and presentation of financial statements disclosure. + References No definition available. + Details
Name: | land_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureLineItems
Namespace Prefix: | land_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_MD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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