Annual report pursuant to Section 13 and 15(d)

Real Estate and Lease Intangibles - Additional Information (Detail)

v2.4.1.9
Real Estate and Lease Intangibles - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Farm
Dec. 31, 2014
Farm
acre
Dec. 31, 2013
Farm
acre
Dec. 31, 2012
Jul. 31, 2014
Jan. 20, 2014
Oct. 21, 2013
Mar. 27, 2014
Jun. 17, 2014
Apr. 30, 2014
Real Estate Properties [Line Items]                      
Number of farm     32land_NumberOfRealEstateFarms                
Number of farms acquired in separate transaction     11land_NumberOfFarmsAcquiredNotCoveredUnderBusinessCombination 9land_NumberOfFarmsAcquiredNotCoveredUnderBusinessCombination              
Additional debt issued     $ 0land_AdditionalDebtToFinanceFarmsAcquisition                
Number of farms acquired     11land_NumberOfFarmsAcquired 9land_NumberOfFarmsAcquired              
Rental income     7,170,318us-gaap_OperatingLeasesIncomeStatementLeaseRevenue 4,027,687us-gaap_OperatingLeasesIncomeStatementLeaseRevenue 3,390,594us-gaap_OperatingLeasesIncomeStatementLeaseRevenue            
Additional insurance reimbursement proceeds 35,648us-gaap_InsuranceSettlementsReceivable   35,648us-gaap_InsuranceSettlementsReceivable                
Aggregate annual real estate property taxes 997,000us-gaap_RealEstateTaxExpense                    
Real estate property tax 457,000us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent   457,000us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent                
Area leased 8,039us-gaap_AreaOfRealEstateProperty   8,039us-gaap_AreaOfRealEstateProperty 6,000us-gaap_AreaOfRealEstateProperty              
Area leased, percentage     100.00%land_PercentageOfAreaOfLand 100.00%land_PercentageOfAreaOfLand              
Percent of total rental revenue     100.00%land_PercentageOfRentalRevenue 100.00%land_PercentageOfRentalRevenue              
Number of Farms   32land_NumberOfFarms 32land_NumberOfFarms 21land_NumberOfFarms              
2013 New Real Estate Activity [Member]                      
Real Estate Properties [Line Items]                      
Number of farms acquired       9land_NumberOfFarmsAcquired
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= land_TwoThousandThirteenNewRealEstateActivityMember 		             
Rental income       305,438us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= land_TwoThousandThirteenNewRealEstateActivityMember 		             
Annualized Straight-line Rent           37,791us-gaap_StraightLineRentAdjustments
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= land_TwoThousandThirteenNewRealEstateActivityMember 		         
Willcox, AZ [Member]                      
Real Estate Properties [Line Items]                      
Irrigation upgrade project,farmland area           1,761us-gaap_AreaOfLand
/ us-gaap_StatementGeographicalAxis
= land_WillcoxAZMember 		         
Cost of irrigation upgrade project           1,200,000land_IrrigationUpgradeProjectCost
/ us-gaap_StatementGeographicalAxis
= land_WillcoxAZMember 		         
Irrigation upgrade project expected at acquisition           336,000land_ProjectCostExpectedFromAcquisition
/ us-gaap_StatementGeographicalAxis
= land_WillcoxAZMember 		         
Number of existing wells rehabilitated           13land_NumberOfExistingWellsRehabilitated
/ us-gaap_StatementGeographicalAxis
= land_WillcoxAZMember 		         
Number of new wells added           2land_NumberOfNewWellsAdded
/ us-gaap_StatementGeographicalAxis
= land_WillcoxAZMember 		         
California [Member]                      
Real Estate Properties [Line Items]                      
Number of farm   14land_NumberOfRealEstateFarms
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		                 
Rental income     4,778,579us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		3,362,020us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		             
Area leased 2,391us-gaap_AreaOfRealEstateProperty
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		  2,391us-gaap_AreaOfRealEstateProperty
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		1,454us-gaap_AreaOfRealEstateProperty
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		             
Area leased, percentage 29.70%land_PercentageOfAreaOfLand
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		  29.70%land_PercentageOfAreaOfLand
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		24.20%land_PercentageOfAreaOfLand
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		             
Percent of total rental revenue     66.60%land_PercentageOfRentalRevenue
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		83.50%land_PercentageOfRentalRevenue
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		             
Number of Farms     14land_NumberOfFarms
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		8land_NumberOfFarms
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		             
Oregon [Member]                      
Real Estate Properties [Line Items]                      
Rental income     1,080,105us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_StatementGeographicalAxis
= stpr_OR 		123,138us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_StatementGeographicalAxis
= stpr_OR 		             
Area leased 2,313us-gaap_AreaOfRealEstateProperty
/ us-gaap_StatementGeographicalAxis
= stpr_OR 		  2,313us-gaap_AreaOfRealEstateProperty
/ us-gaap_StatementGeographicalAxis
= stpr_OR 		2,113us-gaap_AreaOfRealEstateProperty
/ us-gaap_StatementGeographicalAxis
= stpr_OR 		             
Area leased, percentage     28.80%land_PercentageOfAreaOfLand
/ us-gaap_StatementGeographicalAxis
= stpr_OR 		35.20%land_PercentageOfAreaOfLand
/ us-gaap_StatementGeographicalAxis
= stpr_OR 		             
Percent of total rental revenue     15.10%land_PercentageOfRentalRevenue
/ us-gaap_StatementGeographicalAxis
= stpr_OR 		3.00%land_PercentageOfRentalRevenue
/ us-gaap_StatementGeographicalAxis
= stpr_OR 		             
Number of Farms     4land_NumberOfFarms
/ us-gaap_StatementGeographicalAxis
= stpr_OR 		2land_NumberOfFarms
/ us-gaap_StatementGeographicalAxis
= stpr_OR 		             
Florida [Member]                      
Real Estate Properties [Line Items]                      
Rental income     759,398us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_StatementGeographicalAxis
= stpr_FL 		454,135us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_StatementGeographicalAxis
= stpr_FL 		             
Area leased 1,304us-gaap_AreaOfRealEstateProperty
/ us-gaap_StatementGeographicalAxis
= stpr_FL 		  1,304us-gaap_AreaOfRealEstateProperty
/ us-gaap_StatementGeographicalAxis
= stpr_FL 		402us-gaap_AreaOfRealEstateProperty
/ us-gaap_StatementGeographicalAxis
= stpr_FL 		             
Area leased, percentage     16.20%land_PercentageOfAreaOfLand
/ us-gaap_StatementGeographicalAxis
= stpr_FL 		6.70%land_PercentageOfAreaOfLand
/ us-gaap_StatementGeographicalAxis
= stpr_FL 		             
Percent of total rental revenue     10.60%land_PercentageOfRentalRevenue
/ us-gaap_StatementGeographicalAxis
= stpr_FL 		11.30%land_PercentageOfRentalRevenue
/ us-gaap_StatementGeographicalAxis
= stpr_FL 		             
Number of Farms     9land_NumberOfFarms
/ us-gaap_StatementGeographicalAxis
= stpr_FL 		6land_NumberOfFarms
/ us-gaap_StatementGeographicalAxis
= stpr_FL 		             
Trapnell Road [Member]                      
Real Estate Properties [Line Items]                      
Cooling facility upgrade and expansion maximum costs to be incurred             450,000land_CoolingFacilityUpgradeAndExpansionMaximumCostsToBeIncurred
/ us-gaap_RealEstatePropertiesAxis
= land_TrapnellRoadMember 		       
Percentage of increase in rental income of the cost incurred             8.50%land_PercentageIncreaseInRentalIncomeOfTheCostIncurred
/ us-gaap_RealEstatePropertiesAxis
= land_TrapnellRoadMember 		       
Cooling facility upgrade and expansion costs actually incurred               446,108land_CoolingFacilityUpgradeAndExpansionCostsIncurred
/ us-gaap_RealEstatePropertiesAxis
= land_TrapnellRoadMember 		     
West Beach [Member]                      
Real Estate Properties [Line Items]                      
Extended lease term                 9 years    
Maturity date of lease                 Dec. 31, 2023    
Rental income                 540,469us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_RealEstatePropertiesAxis
= land_WestBeachMember 		   
Percentage increase in lease amount                 20.70%land_PercentageIncrementInLeasePayments
/ us-gaap_RealEstatePropertiesAxis
= land_WestBeachMember 		   
San Andreas [Member]                      
Real Estate Properties [Line Items]                      
Extended lease term                   6 years  
Maturity date of lease                   Dec. 31, 2020  
Rental income                   566,592us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_RealEstatePropertiesAxis
= land_SanAndreasMember 		 
Percentage increase in lease amount                   31.30%land_PercentageIncrementInLeasePayments
/ us-gaap_RealEstatePropertiesAxis
= land_SanAndreasMember 		 
20th Avenue [Member]                      
Real Estate Properties [Line Items]                      
Property and casualty loss                     94,243us-gaap_LossFromCatastrophes
/ us-gaap_RealEstatePropertiesAxis
= land_TwentiethAvenueMember
Insurance recoveries     61,500us-gaap_InsuranceRecoveries
/ us-gaap_RealEstatePropertiesAxis
= land_TwentiethAvenueMember 		               
20th Avenue [Member] | 2013 New Real Estate Activity [Member]                      
Real Estate Properties [Line Items]                      
Rental income       20,184us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_RealEstatePropertiesAxis
= land_TwentiethAvenueMember
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= land_TwoThousandThirteenNewRealEstateActivityMember 		             
West Gonzales [Member]                      
Real Estate Properties [Line Items]                      
Insurance proceeds     434,200us-gaap_ProceedsFromInsuranceSettlementInvestingActivities
/ us-gaap_RealEstatePropertiesAxis
= land_WestGonzalesMember 		               
Total repair cost     496,784land_RepairsAndMaintenanceCosts
/ us-gaap_RealEstatePropertiesAxis
= land_WestGonzalesMember 		               
Repair cost, capitalized as real estate     407,096land_RealEstateRepairCostCapitalized
/ us-gaap_RealEstatePropertiesAxis
= land_WestGonzalesMember 		               
Repair and maintenance expense     89,688us-gaap_CostOfPropertyRepairsAndMaintenance
/ us-gaap_RealEstatePropertiesAxis
= land_WestGonzalesMember 		               
West Gonzales [Member] | Adjusted Estimate [Member]                      
Real Estate Properties [Line Items]                      
Property and casualty loss     138,494us-gaap_LossFromCatastrophes
/ us-gaap_RealEstatePropertiesAxis
= land_WestGonzalesMember
/ us-gaap_StatementScenarioAxis
= land_ScenarioAdjustedEstimateMember 		               
Maximum [Member] | Rental Income [Member] | California [Member]                      
Real Estate Properties [Line Items]                      
Percentage of individual tenant represented total rental revenue recorded     10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= land_RentalIncomeMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= land_RentalIncomeMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA 		             
Dole Food Company [Member]                      
Real Estate Properties [Line Items]                      
Rental income     $ 2,900,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ dei_LegalEntityAxis
= land_DoleFoodCompanyMember 		               
Total number of lease agreement with single tenant 2land_NumberOfLeaseWithSingleTenant
/ dei_LegalEntityAxis
= land_DoleFoodCompanyMember 		                   
Area leased 960us-gaap_AreaOfRealEstateProperty
/ dei_LegalEntityAxis
= land_DoleFoodCompanyMember 		  960us-gaap_AreaOfRealEstateProperty
/ dei_LegalEntityAxis
= land_DoleFoodCompanyMember 		               
Area leased, percentage 11.90%land_PercentageOfAreaOfLand
/ dei_LegalEntityAxis
= land_DoleFoodCompanyMember 		                   
Percent of total rental revenue     40.40%land_PercentageOfRentalRevenue
/ dei_LegalEntityAxis
= land_DoleFoodCompanyMember 		66.20%land_PercentageOfRentalRevenue
/ dei_LegalEntityAxis
= land_DoleFoodCompanyMember 		             
Dole Food Company [Member] | Maximum [Member] | Rental Income [Member]                      
Real Estate Properties [Line Items]                      
Percentage of individual tenant represented total rental revenue recorded 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= land_RentalIncomeMember
/ dei_LegalEntityAxis
= land_DoleFoodCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		    20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= land_RentalIncomeMember
/ dei_LegalEntityAxis
= land_DoleFoodCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		             
Separate Tenant [Member]                      
Real Estate Properties [Line Items]                      
Percent of total rental revenue     10.60%land_PercentageOfRentalRevenue
/ dei_LegalEntityAxis
= land_SeparateTenantsMember