Quarterly report [Sections 13 or 15(d)]

Equity and Mezzanine Equity - Narrative (Details)

v3.25.2
Equity and Mezzanine Equity - Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 01, 2025
Jun. 30, 2025
Dec. 31, 2024
Mar. 26, 2024
Mar. 13, 2024
Mar. 03, 2023
Feb. 20, 2020
Feb. 19, 2020
Class of Stock [Line Items]                
Temporary equity, contract terms, trigger change in control   50.00%            
Common stock, shares outstanding (in shares)   46,508,942 43,986,038       60,290,000 86,290,000
Units held by noncontrolling owners (in shares)   39,474 39,474          
Gladstone Commercial Limited Partnership                
Class of Stock [Line Items]                
Company ownership percentage of voting securities   99.90% 99.90%          
Series D Cumulative Redeemable Preferred Stock                
Class of Stock [Line Items]                
Temporary equity, contract terms, minimum vote needed to trigger change in control from tender offer   90.00%            
Series F Preferred Stock                
Class of Stock [Line Items]                
Prepaid offering costs, expense $ 0.3              
Preferred Stock | Series E Cumulative Redeemable Preferred Stock                
Class of Stock [Line Items]                
Redeemable preferred stock, dividend rate   6.625%            
Preferred Stock | Series G Cumulative Redeemable 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]                
Number of shares sold (in shares)   15,700            
Consideration received   $ 0.4            
Redeemable preferred stock, shares authorized (in shares)             26,000,000  
Common Stock ATM Program, 2023 | BofA, Baird, Goldman Sachs, KeyBanc Capital Markets Inc, and Fifth Third | Common Stock                
Class of Stock [Line Items]                
Maximum aggregate sales price of shares to be issued under open market sale agreement           $ 250.0    
Number of shares sold (in shares)   0            
Common Stock ATM Program, 2024 | BofA, Baird, Goldman Sachs, KeyBanc Capital Markets Inc, and Fifth Third | Common Stock                
Class of Stock [Line Items]                
Maximum aggregate sales price of shares to be issued under open market sale agreement       $ 250.0        
Number of shares sold (in shares)   2,521,007            
Consideration received   $ 38.0            
2024 Registration Statement                
Class of Stock [Line Items]                
Universal registration statement, amount authorized         $ 1,300.0