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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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

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