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Real Estate and Lease Intangibles - Summary of Future Lease Expirations by Year for Properties (Narrative) (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) lease | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rental revenue | $ 17,305,469 | $ 11,888,091 | $ 7,170,318
2017 |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Rental revenue | $ 2,296,025 |  |
2017 | Surface Area Lease Property |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Number of leases | lease | 1 |  |
Rental revenue | $ 32,109 |  |

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- Definition Number of leases. + References No definition available. + Details
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Namespace Prefix: | land_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
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Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |