Annual report pursuant to Section 13 and 15(d)

Real Estate and Lease Intangibles - Summarizes Lease Expirations by Year for Properties with Leases (Detail)

v2.4.1.9
Real Estate and Lease Intangibles - Summarizes Lease Expirations by Year for Properties with Leases (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
acre
Lease
Dec. 31, 2013
acre
Dec. 31, 2012
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 28land_NumberOfExpiringLeases    
Expiring Leased Acreage 8,039us-gaap_AreaOfRealEstateProperty 6,000us-gaap_AreaOfRealEstateProperty  
% of Total Acreage 100.00%land_PercentageOfAggregateAcreage    
Rental Revenue for the Year Ended December 31, 2014 $ 7,170,318us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 4,027,687us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 3,390,594us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
% of Total Rental Revenue 100.00%land_PercentageOfAggregateRentalRevenue    
2015 [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 4land_NumberOfExpiringLeases
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueCurrentMember 		   
Expiring Leased Acreage 405us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueCurrentMember 		   
% of Total Acreage 5.00%land_PercentageOfAggregateAcreage
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueCurrentMember 		   
Rental Revenue for the Year Ended December 31, 2014 386,642us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueCurrentMember 		   
% of Total Rental Revenue 5.40%land_PercentageOfAggregateRentalRevenue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueCurrentMember 		   
2016 [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 2land_NumberOfExpiringLeases
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearTwoMember 		   
Expiring Leased Acreage 204us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearTwoMember 		   
% of Total Acreage 2.50%land_PercentageOfAggregateAcreage
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearTwoMember 		   
Rental Revenue for the Year Ended December 31, 2014 217,331us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearTwoMember 		   
% of Total Rental Revenue 3.00%land_PercentageOfAggregateRentalRevenue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearTwoMember 		   
2017 [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 7land_NumberOfExpiringLeases
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearThreeMember 		   
Expiring Leased Acreage 351us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearThreeMember 		   
% of Total Acreage 4.40%land_PercentageOfAggregateAcreage
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearThreeMember 		   
Rental Revenue for the Year Ended December 31, 2014 424,737us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearThreeMember 		   
% of Total Rental Revenue 5.90%land_PercentageOfAggregateRentalRevenue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearThreeMember 		   
2018 [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 3land_NumberOfExpiringLeases
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearFourMember 		   
Expiring Leased Acreage 370us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearFourMember 		   
% of Total Acreage 4.60%land_PercentageOfAggregateAcreage
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearFourMember 		   
Rental Revenue for the Year Ended December 31, 2014 364,803us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearFourMember 		   
% of Total Rental Revenue 5.10%land_PercentageOfAggregateRentalRevenue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearFourMember 		   
2019 [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 0land_NumberOfExpiringLeases
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearFiveMember 		   
Expiring Leased Acreage 0us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearFiveMember 		   
% of Total Acreage 0.00%land_PercentageOfAggregateAcreage
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearFiveMember 		   
% of Total Rental Revenue 0.00%land_PercentageOfAggregateRentalRevenue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueInYearFiveMember 		   
Thereafter [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Number of Expiring Leases 12land_NumberOfExpiringLeases
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueThereafterMember 		   
Expiring Leased Acreage 6,709us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueThereafterMember 		   
% of Total Acreage 83.50%land_PercentageOfAggregateAcreage
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueThereafterMember 		   
Rental Revenue for the Year Ended December 31, 2014 $ 5,776,805us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueThereafterMember 		   
% of Total Rental Revenue 80.60%land_PercentageOfAggregateRentalRevenue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= land_LeaseExpirationsDueThereafterMember