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Equity and Mezzanine Equity - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Mar. 21, 2024 | Mar. 13, 2024 | Nov. 23, 2022 | Feb. 20, 2020 | Feb. 19, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |
Temporary equity, contract terms, trigger change in control | 50.00% |  |  |  |  |  |
Temporary equity, contract terms, minimum vote needed to trigger change in control from tender offer | 90.00% |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 43,728,098 | 40,000,596 |  |  |  | 60,290,000 | 86,290,000
Units held by noncontrolling owners (in shares) | 39,474 | 310,643 |  |  |  |  |
Gladstone Commercial Limited Partnership |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Company ownership percentage of voting securities | 99.90% | 99.20% |  |  |  |  |
Number of units redeemed in acquisition (in shares) | 271,169 |  |  |  |  |  |
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] |  |  |  |  |  |  |
Number of shares sold (in shares) | 30,180 |  |  |  |  |  |
Consideration received | $ 0.7 |  |  |  |  |  |
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) | 3,450,500 |  |  |  |  |  |
Consideration received | $ 49.5 |  |  |  |  |  |
2022 Registration Statement |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Universal registration statement, amount authorized |  |  |  | $ 1,300.0 |  |  |

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