Annual report pursuant to Section 13 and 15(d)

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

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Real Estate and Lease Intangibles - Summary of Estimated Aggregate Amortization Expense and Estimated Net Impact on Rental Income (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
Estimated Amortization Expense, 2015 $ 676,448us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
Estimated Amortization Expense, 2016 289,465us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
Estimated Amortization Expense, 2017 161,781us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
Estimated Amortization Expense, 2018 41,254us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
Estimated Amortization Expense, 2019 38,542us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Estimated Amortization Expense, Thereafter 110,085us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total aggregate amortization expense 1,317,575us-gaap_FiniteLivedIntangibleAssetsNet 311,064us-gaap_FiniteLivedIntangibleAssetsNet
Estimated Net Increase (Decrease) in Rental Revenue, For the fiscal years ending December 31: 2015 171,636land_EstimatedNetIncreaseDecreaseInRentalRevenueCurrent  
Estimated Net Increase (Decrease) in Rental Revenue, 2016 (5,284)land_EstimatedNetIncreaseDecreaseInRentalRevenueInTwoYears  
Estimated Net Increase (Decrease) in Rental Revenue, 2017 (13,015)land_EstimatedNetIncreaseDecreaseInRentalRevenueInThreeYears  
Estimated Net Increase (Decrease) in Rental Revenue, 2018 0land_EstimatedNetIncreaseDecreaseInRentalRevenueInFourYears  
Estimated Net Increase (Decrease) in Rental Revenue, 2019 0land_EstimatedNetIncreaseDecreaseInRentalRevenueInFiveYears  
Estimated Net Increase (Decrease) in Rental Revenue, Thereafter 0land_EstimatedNetIncreaseDecreaseInRentalRevenueThereafter  
Total Estimated Net Increase (Decrease) in Rental Revenue $ 153,337land_EstimatedNetIncreaseDecreaseInRentalRevenue