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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Parenthetical) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014
Related Party Transactions [Abstract] |  |  |  |
Incentive fee paid to Adviser | $ 41,037 | $ 41,037 | $ 0 | $ 0

X
- Definition Related party transaction incentive fee. + References No definition available. + Details
Name: | land_RelatedPartyTransactionIncentiveFee
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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