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SEGMENT INFORMATION - Summary of Revenue by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 2,417,801 | $ 2,322,521 | $ 7,111,668 | $ 6,947,142
Pay TV |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 1,054,667 | 1,069,946 | 3,122,779 | 3,224,987
Broadband |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 729,907 | 658,278 | 2,143,730 | 1,926,816
Telephony |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 161,351 | 172,479 | 490,888 | 531,701
Business services and wholesale |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 344,193 | 324,642 | 1,014,671 | 967,703
Advertising |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 123,066 | 89,292 | 320,546 | 270,154
Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 4,617 | 7,884 | 19,054 | 25,781
Operating Segments | Cablevision |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 1,721,688 | 1,661,359 | 5,058,709 | 4,962,872
Operating Segments | Cablevision | Pay TV |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 783,252 | 798,583 | 2,313,229 | 2,397,233
Operating Segments | Cablevision | Broadband |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 457,709 | 416,972 | 1,347,486 | 1,218,504
Operating Segments | Cablevision | Telephony |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 130,494 | 140,830 | 399,714 | 432,710
Operating Segments | Cablevision | Business services and wholesale |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 242,305 | 230,200 | 713,240 | 689,708
Operating Segments | Cablevision | Advertising |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 105,719 | 72,316 | 276,343 | 216,250
Operating Segments | Cablevision | Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 2,209 | 2,458 | 8,697 | 8,467
Operating Segments | Cequel Corp. [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 696,873 | 661,642 | 2,062,297 | 1,984,750
Operating Segments | Cequel Corp. [Member] | Pay TV |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 271,415 | 271,363 | 809,550 | 827,754
Operating Segments | Cequel Corp. [Member] | Broadband |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 272,198 | 241,306 | 796,244 | 708,312
Operating Segments | Cequel Corp. [Member] | Telephony |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 30,857 | 31,649 | 91,174 | 98,991
Operating Segments | Cequel Corp. [Member] | Business services and wholesale |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 101,888 | 94,442 | 301,431 | 277,995
Operating Segments | Cequel Corp. [Member] | Advertising |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 18,107 | 17,456 | 53,541 | 54,384
Operating Segments | Cequel Corp. [Member] | Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 2,408 | 5,426 | 10,357 | 17,314
Eliminations |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | (760) | (480) | (9,338) | (480)
Eliminations | Pay TV |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Eliminations | Broadband |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Eliminations | Telephony |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Eliminations | Business services and wholesale |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Eliminations | Advertising |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | (760) | (480) | (9,338) | (480)
Eliminations | Other |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | $ 0 | $ 0 | $ 0 | $ 0

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