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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Related Party Transactions [Abstract] |  |  |  |  |
Management fee | [1] | $ 328,392 | $ 236,531 | $ 624,140 | $ 477,495
Credit from voluntary, irrevocable waiver by Adviser's board of directors | [1] |  |  | (320,905) |
Net fee to our Adviser |  | 328,392 | 236,531 | 303,235 | 477,495
Administration fee | [1] | $ 177,852 | $ 65,047 | $ 308,788 | $ 131,205
[1] | Refer to Note 4, "Related-Party Transactions," for additional information.

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- Definition Administration fee. + References No definition available. + Details
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Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Management fee expense net of credit to incentive fee. + References No definition available. + Details
Name: | land_ManagementFeeExpenseNetOfCreditToIncentiveFee
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Related party transaction credit from voluntary irrevocable. + References No definition available. + Details
Name: | land_RelatedPartyTransactionCreditFromVoluntaryIrrevocable
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_ManagementFeeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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