Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Detail)

v2.4.1.9
Related-Party Transactions - Additional Information (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Related Party Transactions [Abstract]        
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   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      
Increase in percentage of fee paid to administrator 98.00%land_IncreaseDecreaseInPercentageOfAdministrativeFee 137.00%land_IncreaseDecreaseInPercentageOfAdministrativeFee