Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail)

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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Related Party Transactions [Abstract]    
Management fee $ 295,748us-gaap_ManagementFeeExpense [1] $ 240,964us-gaap_ManagementFeeExpense [1]
Credit from voluntary, irrevocable waiver by Adviser's board of directors (320,905)land_RelatedPartyTransactionCreditFromVoluntaryIrrevocable [1]  
Net fee to our Adviser (25,157)land_ManagementFeeExpenseNetOfCreditToIncentiveFee 240,964land_ManagementFeeExpenseNetOfCreditToIncentiveFee
Administration fee $ 130,936land_AdministrationFee [1] $ 66,158land_AdministrationFee [1]
[1] Refer to Note 4, "Related-Party Transactions," for additional information.