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Equity and Mezzanine Equity - Narrative (Details) - USD ($) $ in Millions |  | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2025 | Sep. 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) |  | 48,400,749 | 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) |  | 4,412,814 |  |  |  |  |  |
Consideration received |  | $ 61.0 |  |  |  |  |  |
2024 Registration Statement |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Universal registration statement, amount authorized |  |  |  |  | $ 1,300.0 |  |  |

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