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Borrowings - Summary of Mortgage Note Payable and Line of Credit (Parenthetical) (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Sep. 30, 2015 | Dec. 31, 2014
MetLife Mortgage Notes Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Remaining availability |  | $ 2,000,000 | $ 13,800,000
Metlife Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Remaining availability |  | $ 2,000,000 | $ 13,800,000
Farm Credit Mortgage Notes Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Reduced stated interest rate | 12.70% | 12.70% | 12.70%
Farmer Mac Bonds Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Remaining availability |  | $ 0 | $ 0

X
- Definition Long Term Debt Additional Available Amount + References No definition available. + Details
Name: | land_LongTermDebtAdditionalAvailableAmount
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Incremental percentage increase (decrease) in the stated rate on a debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentInterestRateIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=land_MetLifeMortgageNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=land_MetLifeLineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=land_FarmCreditMortgageNotesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=land_FarmerMacBondsPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |