Quarterly report pursuant to Section 13 or 15(d)

Business - Additional Information (Detail)

v3.10.0.1
Business - Additional Information (Detail) - a
 6 Months Ended
Jun. 11, 2018
Jun. 30, 2018
Dec. 31, 2017
Oct. 17, 2017
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Number of acres   51,135    
Gladstone Land Limited Partnership        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Company's ownership percent (as percent)   95.70% 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   7,465   169
Ventura County California        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Operating lease, term (in years) 10 years