Quarterly report pursuant to Section 13 or 15(d)

Equity and Mezzanine Equity - Additional Information (Details)

v3.23.1
Equity and Mezzanine Equity - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Feb. 20, 2020
Feb. 19, 2020
Jan. 29, 2020
Class of Stock [Line Items]          
Temporary equity, contract terms, trigger change in control 50.00%        
Common stock, shares outstanding (in shares) 39,998,220 39,744,359 60,290,000 86,290,000  
Units held by noncontrolling owners (in shares) 391,468 391,468      
Gladstone Commercial Limited Partnership          
Class of Stock [Line Items]          
Company ownership percentage of voting securities 99.00% 99.00%      
Series D Preferred Stock          
Class of Stock [Line Items]          
Temporary equity, contract terms, minimum vote needed to trigger change in control from tender offer 90.00%        
Preferred Stock | Series E Preferred Stock          
Class of Stock [Line Items]          
Redeemable preferred stock, dividend rate 6.625%        
Preferred Stock | Series G Preferred Stock          
Class of Stock [Line Items]          
Redeemable preferred stock, dividend rate 6.00%        
Preferred Stock | Series F Preferred Stock          
Class of Stock [Line Items]          
Redeemable preferred stock, shares issued (in shares) 22,256        
Consideration received $ 0.5        
Redeemable preferred stock, shares authorized (in shares)     26,000,000    
Common Stock ATM Program | Common Stock          
Class of Stock [Line Items]          
Universal registration statement, amount authorized         $ 63.0
Common Stock ATM Program | Baird, Goldman Sachs, Stifel, Fifth Third, and U.S. Bancorp Investments, Inc. | Common Stock          
Class of Stock [Line Items]          
Redeemable preferred stock, shares issued (in shares) 200,000        
Maximum aggregate sales price of shares to be issued under open market sale agreement $ 250.0        
Common Stock ATM Program | Baird, Goldman Sachs, Stifel, and Fifth Third | Common Stock          
Class of Stock [Line Items]          
Consideration received 4.0        
Maximum aggregate sales price of shares to be issued under open market sale agreement $ 100.0        
2020 Universal Shelf          
Class of Stock [Line Items]          
Universal registration statement, amount authorized         800.0
2020 Universal Shelf | Preferred Stock | Series F Preferred Stock          
Class of Stock [Line Items]          
Universal registration statement, amount authorized         $ 636.5