v3.25.1
FAIR VALUE MEASUREMENT - Carrying Values and Estimated Fair Values of Debt Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Inputs, Level 1 [Member] | Money market funds (a) | Fair Value Measured on a Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds (a) $ 191,600 $ 158,648
Fair Value, Inputs, Level 1 [Member] | CSC Holdings | Money market funds (a) | Fair Value Measured on a Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds (a) 184,076 151,205
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, fair value 25,165,576 24,912,126
Carrying Amount | Fair Value, Inputs, Level 2 [Member] | CSC Holdings | Credit facility debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, fair value 7,446,156 7,156,989
Carrying Amount | Fair Value, Inputs, Level 2 [Member] | CSC Holdings | Senior guaranteed notes and senior secured notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, fair value 11,121,527 11,119,314
Carrying Amount | Fair Value, Inputs, Level 2 [Member] | CSC Holdings | Senior notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, fair value 6,583,528 6,585,181
Carrying Amount | Fair Value, Inputs, Level 2 [Member] | CSC Holdings | Supply chain financing    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, fair value 14,365 50,642
Estimated Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, fair value 20,604,902 20,580,663
Estimated Fair Value | Fair Value, Inputs, Level 2 [Member] | CSC Holdings | Credit facility debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, fair value 7,486,143 7,200,408
Estimated Fair Value | Fair Value, Inputs, Level 2 [Member] | CSC Holdings | Senior guaranteed notes and senior secured notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, fair value 9,473,250 9,503,825
Estimated Fair Value | Fair Value, Inputs, Level 2 [Member] | CSC Holdings | Senior notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, fair value 3,631,144 3,825,788
Estimated Fair Value | Fair Value, Inputs, Level 2 [Member] | CSC Holdings | Supply chain financing    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, fair value $ 14,365 $ 50,642