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Earnings Per Share of Common Stock - Additional Information (Detail) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015
Earnings Per Share [Abstract] |  |  |
Weighted average number of operating partnership units held by noncontrolling limited partners (in shares) | 854,116 | 613,446 |
OP units held by non-controlling limited partners |  | 1,215,306 | 0

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- Definition Operating partnership units held outside. + References No definition available. + Details
Name: | land_OperatingPartnershipUnitsHeldOutside
Namespace Prefix: | land_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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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