Quarterly report pursuant to Section 13 or 15(d)

Business - Additional Information (Detail)

v3.8.0.1
Business - Additional Information (Detail) - a
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Oct. 17, 2017
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]      
Number of acres 51,159    
Gladstone Land Limited Partnership      
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]      
Company's ownership percent (as percent) 94.00% 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 7,465   169