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FAIR VALUE MEASUREMENT - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | $ 23,054,720 | $ 21,919,331
Estimated Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 24,059,171 | 23,279,472
CSC Holdings | Credit facility debt | Carrying Amount | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 4,980,221 | 3,393,306
CSC Holdings | Credit facility debt | Estimated Fair Value | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 5,033,750 | 3,435,000
CSC Holdings | Collateralized indebtedness | Carrying Amount | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 1,400,398 | 1,349,474
CSC Holdings | Collateralized indebtedness | Estimated Fair Value | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 1,352,771 | 1,305,932
CSC Holdings | Senior guaranteed notes | Carrying Amount | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 3,284,419 | 2,291,185
CSC Holdings | Senior guaranteed notes | Estimated Fair Value | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 3,293,125 | 2,420,000
CSC Holdings | Senior notes and debentures | Carrying Amount | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 5,610,048 | 6,409,889
CSC Holdings | Senior notes and debentures | Estimated Fair Value | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 6,245,760 | 7,221,846
CSC Holdings | Notes payable | Carrying Amount | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 42,810 | 56,956
CSC Holdings | Notes payable | Estimated Fair Value | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 42,653 | 55,289
Cablevision | Senior notes and debentures | Carrying Amount | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 1,076,681 | 1,818,115
Cablevision | Senior notes and debentures | Estimated Fair Value | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 1,189,098 | 1,931,239
Cequel Corp. [Member] | Credit facility debt | Carrying Amount | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 1,241,272 | 1,250,217
Cequel Corp. [Member] | Credit facility debt | Estimated Fair Value | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 1,249,188 | 1,258,675
Cequel Corp. [Member] | Senior notes and debentures | Carrying Amount | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 2,811,167 | 2,770,737
Cequel Corp. [Member] | Senior notes and debentures | Estimated Fair Value | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 3,013,615 | 2,983,615
Cequel Corp. [Member] | Notes payable | Carrying Amount | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 34,281 | 8,946
Cequel Corp. [Member] | Notes payable | Estimated Fair Value | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 34,281 | 8,946
Cequel Corp. [Member] | Senior secured notes | Carrying Amount | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | 2,573,423 | 2,570,506
Cequel Corp. [Member] | Senior secured notes | Estimated Fair Value | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt, fair value | $ 2,604,930 | $ 2,658,930

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