v3.26.1
DEBT - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2025
Jul. 08, 2026
Dec. 31, 2025
Debt Instrument [Line Items]          
Proceeds from long-term debt   $ 2,856,954 $ 675,000    
Repayments of line of credit   2,544,621 $ 404,839    
Principal Amount $ 26,741,669 $ 26,741,669     $ 26,407,393
CSC Holdings 11.7400% Senior Guaranteed Notes due Jan 31, 2029 | Secured Debt [Member]          
Debt Instrument [Line Items]          
Stated interest rate 11.75% 11.75%      
Lightpath Fiber Issuer LLC Series 2026-1, Class A-2 5.597% Notes due 2031 | Secured Debt [Member]          
Debt Instrument [Line Items]          
Stated interest rate 5.597% 5.597%      
Lightpath Fiber Issuer LLC Series 2026-1, Class B 5.597% Notes due 2031 | Secured Debt [Member]          
Debt Instrument [Line Items]          
Stated interest rate 5.89% 5.89%      
Secured Fiber Network Revenue Notes          
Debt Instrument [Line Items]          
Debt Issuance Costs, Gross $ 25,281 $ 25,281      
Lightpath Variable Funding Notes          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 100,000 100,000      
Letters of credit outstanding 6,288 6,288      
Line of Credit Facility, Ability to expand Maximum Borrowing Capacity 300,000 300,000      
Lightpath Liquidity Funding Notes          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 45,000 45,000      
Revolving Credit Facility | CSC Holdings Revolving Credit Facility          
Debt Instrument [Line Items]          
Principal Amount 2,225,000 2,225,000     2,125,000
Line of Credit Facility, Maximum Borrowing Capacity 2,475 2,475      
Letters of credit outstanding 174,799 174,799      
Credit facility 2,223,984 2,223,984     2,123,506
Secured Debt [Member] | Cablevision Lightpath Term B Loan          
Debt Instrument [Line Items]          
Principal Amount 0 0     669,183
Credit facility 0 $ 0     667,201
Secured Debt [Member] | Cablevision Lightpath Term B Loan | Alternate base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   2.25%      
Secured Debt [Member] | Incremental Term Loan B-5          
Debt Instrument [Line Items]          
Principal Amount 2,812,500 $ 2,812,500     2,827,500
Line of credit facility, periodic payment amount 7,500        
Credit facility 2,809,643 $ 2,809,643     2,822,895
Secured Debt [Member] | Incremental Term Loan B-5 | Alternate base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.50%      
Secured Debt [Member] | Incremental Term Loan B-5 | Synthetic LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate   2.50%      
Secured Debt [Member] | Unsub Group Credit Facility          
Debt Instrument [Line Items]          
Principal Amount         2,000,000
Credit facility $ 2,923,712 $ 2,923,712     $ 1,898,893
Secured Debt [Member] | Incremental Unsub Group Credit Facility          
Debt Instrument [Line Items]          
Stated interest rate 9.00% 9.00%      
Credit facility $ 1,100,000 $ 1,100,000      
Secured Debt [Member] | Lightpath Fiber Issuer LLC Series 2026-1, Class A-2 5.597% Notes due 2031          
Debt Instrument [Line Items]          
Principal Amount 1,527,000 1,527,000      
Credit facility 1,504,956 1,504,956      
Secured Debt [Member] | Lightpath Fiber Issuer LLC Series 2026-1, Class B 5.597% Notes due 2031          
Debt Instrument [Line Items]          
Principal Amount 130,000 130,000      
Credit facility 128,123 128,123      
Secured Debt [Member] | Secured Fiber Network Revenue Notes          
Debt Instrument [Line Items]          
Principal Amount 1,657,000 1,657,000      
Credit facility $ 1,633,079 $ 1,633,079      
Secured Debt [Member] | Second Amendment to Unsub Group Credit Facility | Subsequent Event          
Debt Instrument [Line Items]          
Credit facility       $ 250,000  
Deferred Costs       $ 13,760