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Debt (6.50% Exchangeable Senior Notes due 2026) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | [2] | Dec. 31, 2024 | Apr. 18, 2024 | Feb. 24, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  | $ 0.01 |  |  | $ 0.01 |  |
Common Stock |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 229,400,000 |  |  |  | $ 229,900,000 |  |
Shares issued | (1,967,000) | [1] |  | (1,967,000) | [1] | 4,210,000 |  |  |
6.50% Exchangeable Senior Notes due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate | 6.50% |  |  | 6.50% |  |  | 6.50% |  |
6.50% Exchangeable Senior Notes due 2026 | Common Stock |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Shares issued in connection with exchange for a portion of outstanding debt |  |  | 12,414,455 |  |  |  | 12,400,000 |  |
Shares issued |  |  |  |  |  |  | 4,200,000 |  |
Convertible Notes | 6.50% Exchangeable Senior Notes due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 229,400,000 |  |  |  | $ 229,900,000 |  | $ 230,000,000
Stated interest rate | 6.50% |  | 6.50% | 6.50% |  |  | 6.50% |  | 6.50%
Debt instrument, maturity date |  |  |  | Feb. 23, 2026 |  |  |  |  |
Debt instrument, payment terms |  |  |  | Interest on the Convertible Notes was payable semi-annually in arrears on March 1 and September 1 of each year, beginning on September 1, 2021. |  |  |  |  |
Debt instrument, commencement date of first required payment |  |  |  | Sep. 01, 2021 |  |  |  |  |
Debt instrument, frequency of payment |  |  |  | semi-annually |  |  |  |  |
Debt exchange, description |  |  |  | Subject to certain restrictions on share ownership and transfer, holders could have exchanged the Convertible Notes at their option prior to the close of business on the business day immediately preceding November 25, 2025, but only under the following circumstances: (1) during the five consecutive business day period after any five consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of Convertible Notes for each trading day of such measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the exchange rate for the Convertible Notes on each such trading day; or (2) upon the occurrence of certain specified corporate events. On or after November 25, 2025, until the close of business on the second scheduled trading day immediately preceding the maturity date of the Convertible Notes, holders could have exchanged their Convertible Notes at any time, regardless of the foregoing circumstances. Upon exchange of a Convertible Note, GEO was to pay or deliver, as the case may be, cash or a combination of cash and shares of the Company’s common stock. |  |  |  |  |
Debt instrument, initial conversion rate per $1,000 principal amount |  |  |  | 108.4011 |  |  |  |  |
Debt instrument, initial conversion price | $ 9.225 |  |  | $ 9.225 |  |  |  |  |
Percentage of principal amount of notes to be purchased |  |  |  | 100.00% |  |  |  |  |
Debt instrument converted amount |  |  | $ 410,000,000 |  |  |  | $ 410,000,000 |  |
Convertible Notes | 6.50% Exchangeable Senior Notes due 2026 | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percentage of trading price per $1,000 principal amount against last reported sale price and exchange rate of notes |  |  |  | 98.00% |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 1,275,000,000 |
Senior Notes | 6.50% Exchangeable Senior Notes due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate | 6.50% |  |  | 6.50% |  |  | 6.50% |  |
[1] | During the third quarter of 2025, the Company repurchased 1,966,779 shares of its common stock in the open market.
[2] | During the second quarter of 2024, the Company retired $229.4 million in aggregate principal amount of its outstanding 6.50% Exchangeable Senior Notes in private exchange transactions for an exchange value of approximately $410 million. The consideration consisted of cash of $229.4 million and 12,414,455 shares of GEO common stock. Of the total amount of shares issued, the Company issued 4,209,847 shares that were previously held in treasury. Refer to Note 10 - Debt for further information.

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