Quarterly report pursuant to Section 13 or 15(d)

Equity - Non-Controlling Interests in OP (Details)

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Equity - Non-Controlling Interests in OP (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Limited Partners' Capital Account [Line Items]      
Price per share of OP units redeemed for cash (in dollars per share) $ 13.21 $ 13.21  
Gladstone Land Limited Partnership      
Limited Partners' Capital Account [Line Items]      
Company's ownership percent (as percent) 96.00% 96.00% 93.20%
OP units held by non-controlling limited partners (in shares)   670,879 1,008,105
OP units held by non-controlling interest limited partners (in shares) 670,879 670,879  
Gladstone Land Limited Partnership | Limited Partner      
Limited Partners' Capital Account [Line Items]      
OP units redeemed (in shares) 46,544 337,226  
Common stock issued (in shares) 46,544 297,811  
Conversion of units (in shares) 46,544 297,811  
OP units redeemed for cash (in shares)   39,415  
OP units redeemed for cash   $ 521