v3.25.4
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
vote
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
Class of Stock [Line Items]      
Advertising costs $ 253,369 $ 263,529 $ 253,777
Concentration Risk, Customer 10 10 10
Document Period End Date Dec. 31, 2025    
Revenue $ 8,590,467 $ 8,954,417 $ 9,237,064
Accounts receivable, trade (less allowance for credit losses of $35,389 and $24,232, respectively) $ 335,820 $ 332,271  
Years for contractual agreements to grant indefeasible rights of use of dark fiber 20,000    
Customer Concentration Risk      
Class of Stock [Line Items]      
concentration of customer to trade receivables 10.00% 10.00%  
CSC Holdings      
Class of Stock [Line Items]      
Membership units outstanding | shares 100 100  
Distributions to parent $ 9,738 $ 8,399 1,793
Revenue 8,590,467 8,954,417 9,237,064
Accounts receivable, trade (less allowance for credit losses of $35,389 and $24,232, respectively) $ 335,820 332,271  
Common Class A      
Class of Stock [Line Items]      
Common stock number of votes per share | vote 1    
Common Class B      
Class of Stock [Line Items]      
Common stock number of votes per share | vote 25    
Common stock conversion ratio 1    
Minimum | Customer Contracts      
Class of Stock [Line Items]      
Enterprise Contract Life 3 years    
Maximum | Customer Contracts      
Class of Stock [Line Items]      
Enterprise Contract Life 5 years    
Franchise      
Class of Stock [Line Items]      
Franchise fees and other taxes and fees $ 202,030 $ 212,207 $ 219,988