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Business - Additional Information (Detail)	3 Months Ended
	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%

X

- 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

X

- 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: