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Earnings Per Share of Common Stock - Additional Information (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Weighted average number of operating partnership units held by noncontrolling limited partners (in shares)	224,940	0	256,621	215,499

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- Definition

Weighted Average Number of Operating Partnership Units Held By Noncontrolling Interest

+ References

No definition available.

+ Details

Name:	land_WeightedAverageNumberOfOperatingPartnershipUnitsHeldByNoncontrollingInterest
Namespace Prefix:	land_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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