Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions - Additional Information (Detail)

v2.4.1.9
Related-Party Transactions - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transactions [Abstract]          
Maximum annual management fee     2.00%land_MaximumManagementAdvisoryFeeAsPercentageOfAverageInvestedAssets    
Reimbursement for overhead expenses     2.00%land_MaximumOverheadExpensesAsPercentageOfAverageInvestedAssets    
Amount of payroll and benefits reimbursed     2.00%land_MaximumPayrollAndBenefitsReimbursedAsPercentageOfAverageInvestedAssets    
Overhead expense reimbursements limitation period     1 year    
Annual base management fee, in percentage of stockholders' equity, in excess of recorded value of preferred stock     1.00%land_AnnualBaseManagementFeeInPercentageOfStockholdersEquityInExcessOfRecordedValueOfPreferredStock    
Expected annual base management fee     2.00%land_PercentageOfExpectedAnnualBaseManagementFeeToAggregateStockholdersEquity    
Pre-incentive quarterly fee FFO in percentage of common stockholders equity that will reward the advisor     1.75%land_IncentiveFeePerAdvisoryAgreement    
Pre-incentive annual fee FFO in percentage of common stockholders equity that will reward the advisor     7.00%land_AnnualizedIncentiveFeePerAdvisoryAgreement    
Amount to be paid to Adviser in percentage of pre-incentive fee condition one     100.00%land_AmountToBePaidToAdviserInPercentageOfPreIncentiveFeeConditionOne    
Pre-incentive fee in percentage of common stockholders equity that awards adviser hundred percent of amount of pre-incentive fee, maximum percentage     2.1875%land_PreIncentiveFeeInPercentageOfCommonStockholdersEquityThatAwardsAdviserHundredPercentOfAmountOfPreIncentiveFeeMaximumPercentage    
Adviser will receive 100% of the amount of the pre-incentive fee FFO annually that exceeds the hurdle but less than     8.75%land_MaximumAnnualPercentageOfAdjustedStockholdersEquityToPayFullPreIncentiveFeeToAdviser    
Amount to be paid to Adviser in percentage of pre-incentive fee condition two     20.00%land_AmountToBePaidToAdviserInPercentageOfPreIncentiveFeeConditionTwo    
Pre-incentive fee in percentage of common stockholders' equity that awards the adviser 20% of the amount of the pre-incentive fee, minimum percentage     2.1875%land_PreIncentiveFeeInPercentageOfCommonStockholdersEquityThatAwardsAdviserTwentyPercentOfAmountOfPreIncentiveFeeMinimumPercentage    
Incentive fee paid to adviser $ 41,037land_RelatedPartyTransactionIncentiveFee   $ 0land_RelatedPartyTransactionIncentiveFee $ 0land_RelatedPartyTransactionIncentiveFee $ 0land_RelatedPartyTransactionIncentiveFee
Increase in percentage of fee paid to administrator   137.00%land_IncreaseDecreaseInPercentageOfAdministrativeFee