Annual report pursuant to Section 13 and 15(d)

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

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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Parenthetical) (Detail) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transactions [Abstract]        
Incentive fee paid to adviser $ 41,037land_RelatedPartyTransactionIncentiveFee $ 0land_RelatedPartyTransactionIncentiveFee $ 0land_RelatedPartyTransactionIncentiveFee $ 0land_RelatedPartyTransactionIncentiveFee