Annual report pursuant to Section 13 and 15(d)

Real Estate and Lease Intangibles - Summary of Total Revenue and Earnings Recognized on Properties Acquired (Parenthetical) (Detail)

v2.4.1.9
Real Estate and Lease Intangibles - Summary of Total Revenue and Earnings Recognized on Properties Acquired (Parenthetical) (Detail) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Real Estate Properties [Line Items]        
Amortization expense on intangibles assets due to lease termination in connection with farm acquisition $ 350,684us-gaap_AmortizationOfIntangibleAssets $ 90,669us-gaap_AmortizationOfIntangibleAssets $ 62,213us-gaap_AmortizationOfIntangibleAssets  
2014 New Real Estate Activity [Member]        
Real Estate Properties [Line Items]        
Amortization expense on intangibles assets due to lease termination in connection with farm acquisition $ 43,328us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= land_TwoThousandFourteenNewRealEstateActivityMember
    $ 43,328us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= land_TwoThousandFourteenNewRealEstateActivityMember