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Earnings Per Share of Common Stock - Additional Information (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Weighted average number of operating partnership units held by noncontrolling limited partners (in shares)	16,452	222,494	175,981	217,857

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- Definition

Weighted Average Number of Operating Partnership Units Held By Noncontrolling Interest

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No definition available.

+ Details

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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