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Earnings (Loss) Per Common Share (Details) - shares		3 Months Ended	9 Months Ended
Earnings (Loss) Per Common Share (Details) - shares	Jul. 14, 2025	Sep. 30, 2025	Sep. 30, 2025	Jul. 13, 2025	Dec. 31, 2024
Earnings (Loss) Per Common Share
Potential common shares		1,000,000	1,000,000
Common stock shares issued	29,000,000
Equity awards outstanding				0
Affiliated Entity \| Liberty Broadband
Earnings (Loss) Per Common Share
Aggregate number of shares	10,000
Series A GCI Group common stock
Earnings (Loss) Per Common Share
Common stock shares issued	3,650,938	3,650,938	3,650,938		0
Common stock shares outstanding	3,650,938	3,650,938	3,650,938		0
Series B GCI Group common stock
Earnings (Loss) Per Common Share
Common stock shares issued	400,806	400,806	400,806		0
Common stock shares outstanding	400,806	400,806	400,806		0
Series C GCI Group common stock
Earnings (Loss) Per Common Share
Common stock shares issued	24,646,041	24,646,095	24,646,095		0
Common stock shares outstanding	24,646,041	24,646,095	24,646,095		0