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Earnings Per Share of Common Stock - Additional Information (Details) - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Earnings Per Share [Abstract] |  |
Weighted average number of operating partnership units held by non-controlling interest (in shares) | 131,745 | 235,613

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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