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Business - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Gladstone Land Limited Partnership    
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]    
Company's ownership percent (as percent) 91.70% 87.40%
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]    
Company originally incorporated date Jun. 14, 1997