Annual report pursuant to Section 13 and 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 $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Management Fee:      
Allocated payroll and benefits   $ 38,668land_ManagementAdvisoryFeeAllocatedPayrollAndBenefits $ 224,931land_ManagementAdvisoryFeeAllocatedPayrollAndBenefits
Allocated overhead expenses   7,538land_ManagementAdvisoryFeeAllocatedOverheadExpenses 42,349land_ManagementAdvisoryFeeAllocatedOverheadExpenses
Prior management advisory fee   46,206land_RelatedPartyTransactionPriorManagementAdvisoryFee 267,280land_RelatedPartyTransactionPriorManagementAdvisoryFee
Amended base management fee 1,079,534land_RelatedPartyTransactionAmendedBaseManagementFee 149,403land_RelatedPartyTransactionAmendedBaseManagementFee  
Total management fee 1,079,534us-gaap_ManagementFeeExpense [1] 195,609us-gaap_ManagementFeeExpense [1] 267,280us-gaap_ManagementFeeExpense [1]
Incentive Fee:      
Incentive fee   41,037us-gaap_IncentiveFeeExpense [1]  
Credit from voluntary, irrevocable waiver by Adviser's board of directors   (41,037)land_RelatedPartyTransactionCreditFromVoluntaryIrrevocable  
Net incentive fee 0land_RelatedPartyTransactionNetIncentiveFee 0land_RelatedPartyTransactionNetIncentiveFee 0land_RelatedPartyTransactionNetIncentiveFee
Administration Fee:      
Allocated payroll and benefits   14,034land_AdministrationFeeAllocatedPayrollAndBenefits 143,381land_AdministrationFeeAllocatedPayrollAndBenefits
Allocated overhead expenses   4,498land_AdministrationFeeAllocatedOverheadExpenses 37,017land_AdministrationFeeAllocatedOverheadExpenses
Prior administration fee   18,532land_RelatedPartyTransactionPriorAdministrationFee 180,398land_RelatedPartyTransactionPriorAdministrationFee
Amended administration fee 442,584land_RelatedPartyTransactionAmendedAdministrationFee 175,932land_RelatedPartyTransactionAmendedAdministrationFee  
Total administration fee $ 442,584land_AdministrationFee [1] $ 194,464land_AdministrationFee [1] $ 180,398land_AdministrationFee [1]
[1] Refer to Note 4, "Related-Party Transactions," for additional information