Stock-Based Compensation - Grants of Awards (Details) shares in Thousands	9 Months Ended
Sep. 30, 2025 $ / shares shares
Stock-Based Compensation
Dividend rate	0.00%
Minimum
Stock-Based Compensation
Vesting period	1 year
Maximum
Stock-Based Compensation
Vesting period	5 years
Series A and B GCI Group common stock
Stock-Based Compensation
RSU's granted	0
Time-based restricted stock units \| Share-based payment arrangement, employee \| GCI employees \| Series C GCI Group common stock
Stock-Based Compensation
RSU's granted	105
Weighted average GDFV \| $ / shares	$ 37.85
Time-based restricted stock units \| Share-based payment arrangement, employee \| GCI employees \| Series C GCI Group common stock \| Minimum
Stock-Based Compensation
Vesting period	1 year
Time-based restricted stock units \| Share-based payment arrangement, employee \| GCI employees \| Series C GCI Group common stock \| Maximum
Stock-Based Compensation
Vesting period	3 years
Performance based restricted stock units \| Share-based payment arrangement, employee \| GCI employees \| Series C GCI Group common stock
Stock-Based Compensation
RSU's granted	59
Weighted average GDFV \| $ / shares	$ 37.85
Performance based restricted stock units \| Share-based payment arrangement, employee \| Chief executive officer \| Series C GCI Group common stock
Stock-Based Compensation
RSU's granted	18
Weighted average GDFV \| $ / shares	$ 37.85
Employee Stock Option \| Share-based payment arrangement, employee \| Chief executive officer \| Series C GCI Group common stock
Stock-Based Compensation
Grant of options to purchase	814
Weighted average grant date fair value \| $ / shares	$ 12.35
Employee Stock Option \| Share-based payment arrangement, employee \| Chief executive officer \| Series C GCI Group common stock \| Dec 31, 2026
Stock-Based Compensation
Award vesting rights, percentage	0.33%
Employee Stock Option \| Share-based payment arrangement, employee \| Chief executive officer \| Series C GCI Group common stock \| Dec 31, 2027
Stock-Based Compensation
Award vesting rights, percentage	0.33%
Employee Stock Option \| Share-based payment arrangement, employee \| Chief executive officer \| Series C GCI Group common stock \| Dec 31, 2028
Stock-Based Compensation
Award vesting rights, percentage	0.33%
Employee Stock Option \| Share-based payment arrangement, non-employee \| Non-employee directors \| Series C GCI Group common stock
Stock-Based Compensation
Weighted average GDFV \| $ / shares	$ 11.53
Grant of options to purchase	33

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Percentage of vesting of award under share-based payment arrangement.

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