Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions - Additional Information (Detail)

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Related-Party Transactions - Additional Information (Detail)
 12 Months Ended
May 31, 2018
Jan. 10, 2018
Apr. 01, 2017
Dec. 31, 2019
USD ($)
a
officer
Dec. 31, 2018
USD ($)
a
Aug. 01, 2018
Oct. 17, 2017
USD ($)
a
Related Party Transaction [Line Items]              
Number of executive officers that serve as directors | officer       2      
Management fee (as percent)       2.00%      
Base management fee, quarterly (as percent)       0.50%      
Hurdle rate, quarterly (as percent)       1.75%      
Hurdle rate, annual (as percent)       7.00%      
Pre-incentive Fee FFO (as percent)       100.00%      
Pre-Incentive Fee, exceeded (as percent)       2.1875%      
Pre-Incentive Fee, exceeded, annual (as percent)       8.75%      
Pre-Incentive Fee (as percent)       20.00%      
Cumulative realized capital gains (as percent)       15.00%      
Capital gains fee       $ 0 $ 628,000    
Written notice (in days)     120 days        
Total Acres | a       86,535 73,205    
Base management fee       $ 3,623,000 $ 2,837,000    
Crop inventory       0      
Administration fee       1,207,000 1,275,000    
Financing fee       235,000 83,000    
Dealer-manager fees       $ 7,645,000 2,324,000    
Unsecured Debt | Land Advisers              
Related Party Transaction [Line Items]              
Debt instrument, face amount             $ 1,700,000
Interest rate (as percent)             5.00%
Gladstone Securities              
Related Party Transaction [Line Items]              
Financing fee (as percent)       0.14%      
Financing fee       $ 235,000 83,000    
Taxable REIT Subsidiary              
Related Party Transaction [Line Items]              
Administration fee       57,000 57,000    
Taxable REIT Subsidiary | Land Advisers              
Related Party Transaction [Line Items]              
Base management fee       176,000 176,000    
Preferred Stock | Series B Preferred Stock              
Related Party Transaction [Line Items]              
Preferred stock, dividend rate (as percent) 6.00%            
Selling commission fee (as percent)   7.00%          
Dealer-manager fee (as percent)   3.00%          
Preferred Stock | Series B Preferred Stock | Gladstone Securities              
Related Party Transaction [Line Items]              
Dealer-manager fees       $ 7,600,000 $ 2,300,000    
Ventura County, California              
Related Party Transaction [Line Items]              
Total Acres | a       169     169
Operating lease, term (in years)           10 years  
Gladstone Securities | Minimum | Gladstone Securities              
Related Party Transaction [Line Items]              
Financing fee (as percent)       0.50%      
Gladstone Securities | Maximum | Gladstone Securities              
Related Party Transaction [Line Items]              
Financing fee (as percent)       1.00%