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Stock-Based Compensation - Grants of Awards (Details) - $ / shares	6 Months Ended	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Minimum
Stock-Based Compensation
Vesting period		1 year
Maximum
Stock-Based Compensation
Vesting period		3 years
Series B GCI Group common stock
Stock-Based Compensation
Grant of options to purchase	0
Time-based restricted stock units \| Share-based payment arrangement, employee \| Employees and directors \| Series C GCI Group common stock
Stock-Based Compensation
RSU's granted		578,000
Weighted average GDFV		$ 32.2
Time-based restricted stock units \| Share-based payment arrangement, employee \| Employees and directors \| Series C GCI Group common stock \| Minimum
Stock-Based Compensation
Vesting period		1 year
Time-based restricted stock units \| Share-based payment arrangement, employee \| Employees and directors \| Series C GCI Group common stock \| Maximum
Stock-Based Compensation
Vesting period		3 years
Time-based restricted stock units \| Share-based payment arrangement, employee \| GCI employees \| Series C GCI Group common stock
Stock-Based Compensation
RSU's granted			56,000
Weighted average GDFV			$ 57.83
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
Time-based restricted stock units \| Share-based payment arrangement, employee \| Chief executive officer \| Series C GCI Group common stock
Stock-Based Compensation
RSU's granted		52,000
Weighted average GDFV		$ 14.66
Performance based restricted stock units \| Share-based payment arrangement, employee \| Employees \| Series C GCI Group common stock
Stock-Based Compensation
RSU's granted		63,000
Weighted average GDFV		$ 35.88
Performance based restricted stock units \| Share-based payment arrangement, employee \| GCI employees \| Series C GCI Group common stock
Stock-Based Compensation
RSU's granted			40,000
Weighted average GDFV			$ 56
Vesting period			1 year
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		19,000
Weighted average GDFV		$ 35.88
Employee Stock Option
Stock-Based Compensation
Dividend rate (in %)		0.00%
Risk-free rate (in %)		0.00%
Employee Stock Option \| Series C GCI Group common stock \| Liberty Broadband
Stock-Based Compensation
Grant of options to purchase		0	0
Employee Stock Option \| Series A GCI Group common stock
Stock-Based Compensation
RSU's granted	0
Employee Stock Option \| Series A GCI Group common stock \| Liberty Broadband
Stock-Based Compensation
Grant of options to purchase		0	0
Employee Stock Option \| Series B GCI Group common stock \| Liberty Broadband
Stock-Based Compensation
Grant of options to purchase		0	0
Employee Stock Option \| Share-based payment arrangement, employee \| Series C GCI Group common stock
Stock-Based Compensation
Grant of options to purchase		107,000
Weighted average grant date fair value		$ 10.6
Minimum volatility rates (in%)		36.70%
Maximum volatility rates (in%)		40.40%
Employee Stock Option \| Share-based payment arrangement, employee \| Series C GCI Group common stock \| Minimum
Stock-Based Compensation
Expected term of option (in years)		3 years
Employee Stock Option \| Share-based payment arrangement, employee \| Series C GCI Group common stock \| Maximum
Stock-Based Compensation
Expected term of option (in years)		3 years 8 months 12 days
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		814,000
Weighted average grant date fair value		$ 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
Grant of options to purchase		128,000
Weighted average grant date fair value		$ 10.37