Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Summary of Estimated Aggregate Amortization Expense and Estimated Net Impact on Rental Income (Detail)

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Real Estate and Intangible Assets - Summary of Estimated Aggregate Amortization Expense and Estimated Net Impact on Rental Income (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Estimated Amortization Expense, For the remaining nine months ending December 31, 2015 $ 615,234us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
Estimated Amortization Expense, For the fiscal years ending December 31: 2016 478,400us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
Estimated Amortization Expense, 2017 188,494us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
Estimated Amortization Expense, 2018 68,122us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
Estimated Amortization Expense, 2019 65,410us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
Estimated Amortization Expense, 2020 58,549us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Estimated Amortization Expense, Thereafter 205,385us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total aggregate amortization expense 1,679,594us-gaap_FiniteLivedIntangibleAssetsNet 1,317,575us-gaap_FiniteLivedIntangibleAssetsNet
Estimated Net Increase (Decrease) in Rental Revenue, For the remaining nine months ending December 31, 2015 107,289land_EstimatedNetIncreaseDecreaseInRentalRevenueRemainderOfFiscalYear  
Estimated Net Increase (Decrease) in Rental Revenue, For the fiscal years ending December 31: 2016 (17,004)land_EstimatedNetIncreaseDecreaseInRentalRevenueCurrent  
Estimated Net Increase (Decrease) in Rental Revenue, 2017 (8,437)land_EstimatedNetIncreaseDecreaseInRentalRevenueInTwoYears  
Estimated Net Increase (Decrease) in Rental Revenue, 2018 4,577land_EstimatedNetIncreaseDecreaseInRentalRevenueInThreeYears  
Estimated Net Increase (Decrease) in Rental Revenue, 2019 4,577land_EstimatedNetIncreaseDecreaseInRentalRevenueInFourYears  
Estimated Net Increase (Decrease) in Rental Revenue, 2020 4,577land_EstimatedNetIncreaseDecreaseInRentalRevenueInFiveYears  
Estimated Net Increase (Decrease) in Rental Revenue, Thereafter 8,010land_EstimatedNetIncreaseDecreaseInRentalRevenueThereafter  
Total Estimated Net Increase (Decrease) in Rental Revenue $ 103,589land_EstimatedNetIncreaseDecreaseInRentalRevenue