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Summary of Significant Accounting Policies - Basic net earnings (loss) per common share (Details) - shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Jul. 14, 2025	Jul. 13, 2025
Earnings (Loss) Per Common Share
Common stock shares issued			29,000,000
Weighted average shares - basic	31,000,000
Weighted average shares - diluted	31,000,000
Equity awards outstanding				0
Maximum
Earnings (Loss) Per Common Share
Potential common shares	1,000,000
Series A GCI Group common stock
Earnings (Loss) Per Common Share
Common stock shares issued	3,650,938	0	3,650,938
Common stock shares outstanding	3,650,938	0	3,650,938
Weighted average shares - basic		3,897,599
Weighted average shares - diluted		3,897,599
Series B GCI Group common stock
Earnings (Loss) Per Common Share
Common stock shares issued	400,806	0	400,806
Common stock shares outstanding	400,806	0	400,806
Weighted average shares - basic		427,885
Weighted average shares - diluted		427,885
Series C GCI Group common stock
Earnings (Loss) Per Common Share
Common stock shares issued	35,751,850	0	24,646,041
Common stock shares outstanding	35,751,850	0	24,646,041
Weighted average shares - basic		26,311,154
Weighted average shares - diluted		26,311,154