v3.25.3
Stock-Based Compensation - Outstanding Awards (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Number of RSU's      
Balance beginning 255,000 298,000  
Granted   96,000 160,000
Vested   (106,000)  
Cancelled   (33,000)  
Balance ending   255,000 298,000
Weighted average GDFV      
Weighted average GDFV at beginning $ 93.95 $ 105.81  
Granted   57.07 $ 86.62
Vested   91.32  
Cancelled   101.94  
Weighted average GDFV at ending   $ 93.95 $ 105.81
Total unrecognized compensation cost $ 16,000,000 $ 9,000,000  
Weighted average period for recognition 2 years 4 months 24 days 1 year  
Fair value of vested RSU's   $ 9,000,000 $ 10,000,000
Share-based payment arrangement, option | Series A GCI Group common stock      
Weighted average GDFV      
Share-based payment award, options, outstanding, number 0    
Share-based payment arrangement, option | Series B GCI Group common stock      
Weighted average GDFV      
Share-based payment award, options, outstanding, number 0    
Share-based payment arrangement, option | Series C GCI Group common stock      
Weighted average GDFV      
Share-based payment award, options, outstanding, number 847,000    
Weighted average exercise price $ 37.85    
Weighted average remaining contractual life 4 years 10 months 24 days    
Aggregate intrinsic value $ 0    
GCI Liberty reserved shares 847,000    
Restricted Stock Units (RSUs) [Member] | Series C GCI Group common stock      
Number of RSU's      
Granted 182,000    
Cancelled (9,000)    
GCI Liberty Separation Adjustment 169,000    
Balance ending 342,000    
Weighted average GDFV      
Granted $ 37.85    
Cancelled 31.69    
GCI Liberty Separation Adjustment 29.08    
Weighted average GDFV at ending $ 33.66