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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Management Fee: |  |  |  |
Allocated payroll and benefits |  |  |  | $ 38,668
Allocated overhead expenses |  |  |  | 7,538
Prior management advisory fee |  |  |  | 46,206
Amended base management fee |  | $ 1,343,384 | $ 1,079,534 | 149,403
Total management fee | [1] | 1,343,384 | 1,079,534 | 195,609
Incentive Fee: |  |  |  |
Incentive fee | [1] |  |  | 41,037
Credit from voluntary, irrevocable waiver by Adviser's board of directors |  | (320,905) |  | (41,037)
Net incentive fee |  | (320,905) |  |
Administration Fee: |  |  |  |
Allocated payroll and benefits |  |  |  | 14,034
Allocated overhead expenses |  |  |  | 4,498
Prior administration fee |  |  |  | 18,532
Amended administration fee |  | 679,590 | 442,584 | 175,932
Total administration fee | [1] | $ 679,590 | $ 442,584 | $ 194,464
[1] | Refer to Note 4, "Related-Party Transactions," for additional information.

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- Definition Administration fee. + References No definition available. + Details
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Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Administration fee allocated overhead expenses. + References No definition available. + Details
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- Definition Administration fee allocated payroll and benefits. + References No definition available. + Details
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- Definition Management advisory fee allocated overhead expenses. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Management advisory fee allocated payroll and benefits. + References No definition available. + Details
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Namespace Prefix: | land_
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Balance Type: | debit
Period Type: | duration

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- Definition Related party transaction administration fee. + References No definition available. + Details
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Balance Type: | na
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- Definition Related party transaction amended administration fee. + References No definition available. + Details
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Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Related party transaction amended base management fee. + References No definition available. + Details
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Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Related party transaction credit from voluntary irrevocable. + References No definition available. + Details
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Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Related party transaction incentive fee. + References No definition available. + Details
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Namespace Prefix: | land_
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Balance Type: | na
Period Type: | duration

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- Definition Related party transaction management advisory fee. + References No definition available. + Details
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- Definition Related party transaction net incentive fees paid and credits received. + References No definition available. + Details
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Namespace Prefix: | land_
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Balance Type: | debit
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- Definition Related party transaction prior administration fee. + References No definition available. + Details
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Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Related party transaction prior management advisory fee. + References No definition available. + Details
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Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of expense for incentive rights held by the managing member or general partner, of limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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