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Business - Additional Information (Detail) - a | 9 Months Ended |  |  |
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Sep. 30, 2018 | Jun. 11, 2018 | Dec. 31, 2017 | Oct. 17, 2017
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |
Number of acres | 53,844 |  |  |
Gladstone Land Limited Partnership |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |
Company's ownership percent (as percent) | 96.00% |  | 93.20% |
Land Advisers |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |
Company's ownership percent (as percent) | 100.00% |  |  |
Maryland |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |
Company re-incorporated date | Mar. 24, 2011 |  |  |
Delaware |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |
Company re-incorporated date | May 25, 2004 |  |  |
California |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |
Number of acres | 7,655 |  |  | 169
Ventura County California |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |
Operating lease, term (in years) |  | 10 years |  |

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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919359-209981 + Details
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