Quarterly report pursuant to Section 13 or 15(d)

Business - Additional Information (Detail)

v3.10.0.1
Business - Additional Information (Detail) - a
 9 Months Ended
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