No definition available.

Name:	land_AdditionsAbstract
Namespace Prefix:	land_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Deductions.

No definition available.

Name:	land_DeductionsAbstract
Namespace Prefix:	land_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

SEC Schedule, 12-28, Real Estate Companies, Investment In Real Estate, Investment In Real Estate, Held For Sale

No definition available.

Name:	land_SECSchedule1228RealEstateCompaniesInvestmentInRealEstateInvestmentInRealEstateHeldForSale
Namespace Prefix:	land_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 970
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28(Column E)(Footnote 4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478979/970-360-S99-1

Name:	us-gaap_RealEstateCostOfRealEstateSold
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 970
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28(Column E))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478979/970-360-S99-1

Name:	us-gaap_RealEstateGrossAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate.

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

Amount of increase in real estate investments from acquisitions other than through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate.

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

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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

Amount of write-down or reserve recognized in the income statement on real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 970
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28(Column E)(Footnote 5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478979/970-360-S99-1

GLADSTONE LAND Corp 10-K