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Real Estate and Intangible Assets - Additional Information (Detail) |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 25, 2016 USD ($) | Jul. 15, 2016 USD ($) | Jul. 05, 2016 USD ($) a | Apr. 05, 2016 USD ($) | Feb. 08, 2016 USD ($) | Feb. 01, 2016 USD ($) | Sep. 30, 2016 USD ($) a | Sep. 30, 2015 USD ($) a | Sep. 30, 2016 USD ($) a Farm transaction | Sep. 30, 2015 USD ($) a Farm transaction | Jun. 30, 2017 USD ($) | Dec. 31, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  | 14 years | 6 years 2 months 12 days |  |
No. of Farms | Farm |  |  |  |  |  |  |  |  | 56 | 41 |  |
Tenant improvements, net of depreciation |  |  |  |  |  |  | $ 1,882,114 |  | $ 1,882,114 |  |  | $ 1,302,009
Tenant improvements, depreciation and rental revenue |  |  |  |  |  |  | 30,753 | $ 14,780 | 98,225 | $ 27,502 |  |
Amortization expense related to intangible assets |  |  |  |  |  |  | 207,234 | 193,621 | 582,095 | 645,448 |  |
Amortization of acquired above market lease values |  |  |  |  |  |  | 1,627 | 4,496 | 4,882 | 15,286 |  |
Total accretion related to below-market lease values |  |  |  |  |  |  | 8,951 | 52,591 | $ 23,613 | 160,324 |  |
Number of farms acquired | Farm |  |  |  |  |  |  |  |  | 6 |  |  |
Additional rental income |  |  |  |  |  |  | 4,467,217 | 3,080,240 | $ 12,388,303 | $ 8,483,023 |  |
Number of tenants | Farm |  |  |  |  |  |  |  |  | 39 |  |  |
Percent of total rental revenue |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |
Tenant reimbursements |  |  |  |  |  |  | $ 1,957 | $ 3,313 | $ 7,989 | $ 10,108 |  |
Area leased | a |  |  |  |  |  |  | 33,800 | 14,880 | 33,800 | 14,880 |  |
Area leased, percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |
Settlement payment |  |  | $ 164,000 |  |  |  |  |  |  |  |  |
Settlement interest |  |  | 4,000 |  |  |  |  |  |  |  |  |
Land & Buildings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  | $ 1,224,612 | $ 595,539 | $ 3,161,434 | $ 1,647,177 |  |
California [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
No. of Farms | Farm |  |  |  |  |  |  |  |  | 21 | 18 |  |
Additional rental income |  |  |  |  |  |  |  |  | $ 6,986,099 | $ 5,652,357 |  |
Percent of total rental revenue |  |  |  |  |  |  |  |  | 56.40% | 66.60% |  |
Area leased | a |  |  |  |  |  |  | 6,516 | 3,576 | 6,516 | 3,576 |  |
Area leased, percentage |  |  |  |  |  |  |  |  | 19.30% | 24.00% |  |
Florida [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
No. of Farms | Farm |  |  |  |  |  |  |  |  | 15 | 12 |  |
Additional rental income |  |  |  |  |  |  |  |  | $ 2,407,893 | $ 1,458,433 |  |
Percent of total rental revenue |  |  |  |  |  |  |  |  | 19.40% | 17.20% |  |
Area leased | a |  |  |  |  |  |  | 5,567 | 4,401 | 5,567 | 4,401 |  |
Area leased, percentage |  |  |  |  |  |  |  |  | 16.50% | 29.60% |  |
McIntosh Road [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional rental income |  |  |  |  | $ 63,000 |  |  |  |  |  |  |
Extended lease term |  |  |  |  | 3 years |  |  |  |  |  |  |
Maturity date of lease |  |  |  |  | Jun. 30, 2019 |  |  |  |  |  |  |
Percentage increase in lease amount |  |  |  |  | 17.90% |  |  |  |  |  |  |
McIntosh Road [Member] | Dover, FL [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
No. of Farms | Farm |  |  |  |  |  |  |  |  | 2 |  |  |
Maturity date of lease |  |  |  |  |  |  |  |  | Jun. 30, 2017 |  |  |
Area leased | a |  |  |  |  |  |  | 94 |  | 94 |  |  |
Sycamore Road [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expended or accrued for capital improvements |  |  |  |  |  | $ 993,319 |  |  |  |  |  |
Additional rental income |  |  |  |  |  | $ 53,550 |  |  |  |  |  |
Wauchula Road [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional rental income |  |  |  | $ 92,634 |  |  |  |  |  |  |  |
Cost of improvements |  |  |  | 569,607 |  |  |  |  |  |  |  |
Parrish Road [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional rental income |  |  |  | 139,073 |  |  |  |  |  |  |  |
Tenant reimbursements |  |  |  |  |  |  |  |  | $ 745,000 |  |  |
Parrish Road [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of real estate property additional compensation committed upon irrigation improvements and upgrades to be incurred |  |  |  | $ 500,000 |  |  |  |  |  |  |  |
Espinosa Road [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Extended lease term | 4 years |  |  |  |  |  |  |  |  |  |  |
Settlement payment |  |  | $ 156,000 |  |  |  |  |  |  |  |  |
Area of nonfarmable land | a |  |  | 4.5 |  |  |  |  |  |  |  |  |
Annualized straight line rental income | $ 997,017 |  |  |  |  |  |  |  |  |  |  |
Percentage increase in rental revenue | 28.10% |  |  |  |  |  |  |  |  |  |  |
Colding Loop [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Minimum rental payments |  | $ 72,400 |  |  |  |  |  |  |  |  |  |
Deferred Rent Asset and Rental Income Written Off |  |  |  |  |  |  | $ 20,697 |  | $ 84,600 |  |  |
Amortization of deferred charges |  |  |  |  |  |  | 8,635 |  |  |  |  |
Dole Food Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
No. of Farms | Farm |  |  |  |  |  |  |  |  | 2 |  |  |
Additional rental income |  |  |  |  |  |  |  |  | $ 2,200,000 |  |  |
Percent of total rental revenue |  |  |  |  |  |  |  |  | 17.80% |  |  |
Lease One [Member] | McIntosh Road [Member] | Dover, FL [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of lease |  |  |  |  |  |  |  |  | Jun. 30, 2017 |  |  |
Lease Two [Member] | McIntosh Road [Member] | Dover, FL [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of lease |  |  |  |  |  |  |  |  | Jun. 30, 2019 |  |  |
2016 New Real Estate Activity [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
No. of Farms | Farm |  |  |  |  |  |  |  |  | 13 |  |  |
Number of transactions | transaction |  |  |  |  |  |  |  |  | 7 |  |  |
Additional rental income |  |  |  |  |  |  | $ 769,171 |  | $ 1,474,688 |  |  |
Area leased | a |  |  |  |  |  |  | 16,988 |  | 16,988 |  |  |
2015 New Real Estate Activity [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
No. of Farms | Farm |  |  |  |  |  |  |  |  |  | 9 |  |
Number of transactions | transaction |  |  |  |  |  |  |  |  |  | 6 |  |
Additional rental income |  |  |  |  |  |  |  | $ 629,000 |  | $ 1,086,976 |  |
Area leased | a |  |  |  |  |  |  |  | 6,841 |  | 6,841 |  |
2015 New Real Estate Activity [Member] | Parrish Road [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional rental income |  |  |  |  |  |  |  | $ 62,958 |  | $ 140,133 |  |
2015 New Real Estate Activity [Member] | Espinosa Road [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional rental income |  |  |  |  |  |  |  | $ 194,586 |  | $ 575,387 |  |
Scenario, Forecast [Member] | Espinosa Road [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property taxes |  |  |  |  |  |  |  |  |  |  | $ 144,000 |
Below-market lease and deferred revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  | 20 years 10 months 24 days | 0 years |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  | 0 years | 9 years 6 months |  |

X
- Definition Acquisition of real estate property additional compensation committed upon irrigation improvements and upgrades to be incurred. + References No definition available. + Details
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- Definition Amortization of Above Market Lease + References No definition available. + Details
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- Definition Annualized Straight Line Rental Income + References No definition available. + Details
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- Definition Deferred rent asset and rental income written off. + References No definition available. + Details
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- Definition Nonfarmable area of land. + References No definition available. + Details
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- Definition Number of farms acquired. + References No definition available. + Details
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- Definition Number of real estate farms. + References No definition available. + Details
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- Definition Number of Tenants, Lease Properties + References No definition available. + Details
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- Definition Number of Transactions + References No definition available. + Details
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- Definition Percentage Increase In Rental Revenue + References No definition available. + Details
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- Definition Percentage increment in lease payments. + References No definition available. + Details
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- Definition Percentage of area of land. + References No definition available. + Details
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- Definition Percentage of rental revenue. + References No definition available. + Details
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- Definition Tenant Improvements, Depreciation and Rental Revenue + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition The amount of amortization of deferred charges applied against earnings during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Area of a real estate property. + References No definition available. + Details
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- Definition Amount of increase (decrease) in acquired leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the period in the amount of cash payments due to taxing authorities for non-income-related taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
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- Definition Interest expense (income) directly attributable to an award in settlement of litigation. + References No definition available. + Details
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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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- Definition This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy. + References No definition available. + Details
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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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- Definition Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Period Type: | instant

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- Definition In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_TenantReimbursements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandAndBuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_FL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=land_McIntoshRoadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=land_DoverFlMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=land_SycamoreRoadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=land_WauchulaRoadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=land_ParrishRoadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=land_EspinosaRoadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=land_ColdingLoopMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CounterpartyNameAxis=land_DoleFoodCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=land_LeaseOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=land_LeaseTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=land_TwoThousandSixteenNewRealEstateActivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=land_TwoThousandFifteenNewRealEstateActivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=land_BelowmarketleaseanddeferredrevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |