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Stockholders' Equity - Schedule of Distributions On Common Stock (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2015
Equity [Abstract] |
Percentage of qualified dividends | 98.53746%

X
- Definition Percentage of distributions classified as qualified dividends. + References No definition available. + Details
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Namespace Prefix: | land_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration