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DERIVATIVE CONTRACTS AND COLLATERALIZED INDEBTEDNESS - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Apr. 30, 2018 USD ($) | Jun. 30, 2016 USD ($) instrument
Derivative [Line Items] |  |  |  |  |
Gain (loss) on investments and sale of affiliate interests, net | $ 111,684,000 |  | $ (199,312,000) |  |
Interest Rate Swap, Conversion, Term Loan Facility [Member] [Domain] | Not Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative notional amount |  |  |  | $ 2,970,000,000 |
Interest Rate Swap, Conversion, Incremental Term Loan Facility [Member] [Domain] [Domain] | Not Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative notional amount |  |  |  | $ 1,496,250 |
Derivative, fixed interest rate |  |  |  | 0.226% |
Interest Rate Swap, Conversion, Term Loan Facility Cequel [Member] [Domain] [Domain] | Not Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative notional amount |  |  |  | $ 1,255,513,000 |
Derivative, fixed interest rate |  |  |  | 0.225% |
Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of gain (loss) recognized |  | $ (19,554,000) | (64,405,000) |  |
Interest Rate Swap | Not Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of derivative instruments held | instrument |  |  |  |  | 2
Interest Rate Swap, Conversion, Tranche One | Not Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative notional amount |  |  |  |  | $ 750,000,000
Derivative, fixed interest rate |  |  |  |  | 1.6655%
Interest Rate Swap, Conversion, Tranche Two | Not Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative notional amount |  |  |  |  | $ 750,000,000
Derivative, fixed interest rate |  |  |  |  | 1.68%
Prepaid forward contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of gain (loss) recognized | $ (79,628,000) |  | $ 130,883,000 |  |

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