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           Business and Organization - Additional Information (Detail) (Gladstone Land Advisers, Inc. [Member], USD $) 
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        9 Months Ended | 
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           Sep. 30, 2014 
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           Gladstone Land Advisers, Inc. [Member] 
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| Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] | |
| Fees related to leasing of real estate or ancillary services | $ 0 | 
| Company's ownership percent of voting securities of Land Advisers | 100.00% | 
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- Definition 
          Fees Related To Leasing Of Real Estate Or Ancillary Services No definition available. 
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- Details 
          
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- Definition 
          Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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