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DEBT - Notes Payable to Affiliates and Related Perties (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jun. 21, 2016
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  | $ 6,282,938,000 |  | $ 4,693,675,000 |
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  | $ 15,739,245,000 |  | 16,289,245,000 |
Cablevision | Affiliates | Notes payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  |  |  | $ 1,750,000,000
Interest payable |  |  |  |  | 529,000
Debt premium |  |  |  |  | 513,723,000
Interest expense |  |  | $ 90,405,000 |  |
Cequel and Cequel Capital 7.5% Senior Notes due April 1, 2028 [Member] [Domain] | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 107.50% |  |  |
Principal Amount |  | $ 1,050,000,000 |  | $ 0 |
Stated interest rate |  | 7.50% |  |  |
Notes Payable at 10.75% | Cablevision | Affiliates | Notes payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  |  |  | $ 875,000,000
Stated interest rate |  |  |  |  | 10.75%
Notes Payable at 11% | Cablevision | Affiliates | Notes payable |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  |  |  | $ 875,000,000
Stated interest rate |  |  |  |  | 11.00%
Organizational Transactions Prior to IPO |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stock issued | $ 2,264,252,000 |  |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Amount, after accumulated amortization, of debt premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 + Details
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