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SEGMENT INFORMATION - Summary of Revenue by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 2,364,153 | $ 2,322,362 | $ 4,693,867 | $ 4,624,621
Pay TV |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 1,034,404 | 1,071,163 | 2,068,112 | 2,155,041
Broadband |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 712,202 | 642,620 | 1,413,823 | 1,268,538
Telephony |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 163,499 | 178,261 | 329,537 | 359,222
Business services and wholesale |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 337,388 | 323,641 | 670,478 | 643,061
Advertising |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 109,898 | 97,501 | 197,480 | 180,862
Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 6,762 | 9,176 | 14,437 | 17,897
Operating Segments | Cablevision |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 1,685,727 | 1,659,526 | 3,337,021 | 3,301,513
Operating Segments | Cablevision | Pay TV |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 766,257 | 796,456 | 1,529,977 | 1,598,650
Operating Segments | Cablevision | Broadband |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 449,426 | 405,199 | 889,777 | 801,532
Operating Segments | Cablevision | Telephony |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 133,635 | 145,323 | 269,220 | 291,880
Operating Segments | Cablevision | Business services and wholesale |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 236,763 | 230,964 | 470,935 | 459,508
Operating Segments | Cablevision | Advertising |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 95,981 | 78,802 | 170,624 | 143,934
Operating Segments | Cablevision | Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 3,665 | 2,782 | 6,488 | 6,009
Operating Segments | Cequel Corp. [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 682,875 | 662,836 | 1,365,424 | 1,323,108
Operating Segments | Cequel Corp. [Member] | Pay TV |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 268,147 | 274,707 | 538,135 | 556,391
Operating Segments | Cequel Corp. [Member] | Broadband |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 262,776 | 237,421 | 524,046 | 467,006
Operating Segments | Cequel Corp. [Member] | Telephony |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 29,864 | 32,938 | 60,317 | 67,342
Operating Segments | Cequel Corp. [Member] | Business services and wholesale |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 100,625 | 92,677 | 199,543 | 183,553
Operating Segments | Cequel Corp. [Member] | Advertising |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 18,366 | 18,699 | 35,434 | 36,928
Operating Segments | Cequel Corp. [Member] | Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 3,097 | $ 6,394 | 7,949 | $ 11,888
Eliminations |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | (4,449) |  | (8,578) |
Eliminations | Pay TV |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 0 |  | 0 |
Eliminations | Broadband |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 0 |  | 0 |
Eliminations | Telephony |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 0 |  | 0 |
Eliminations | Business services and wholesale |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 0 |  | 0 |
Eliminations | Advertising |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | (4,449) |  | (8,578) |
Eliminations | Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 0 |  | $ 0 |

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