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INCOME TAX - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Income tax expense (benefit) allocated to noncontrolling interest |  | $ 4,400 | $ (10,600) | $ 8,600 | $ 7,300
Provisional income tax benefit related to 2017 US Tax Reform Act |  |  | 23,300 | 158,700 |
Income tax benefit related to change in tax rate |  |  |  | 222,400 |
Provisional income tax expense (benefit) from deferred foreign earnings |  |  |  | 63,700 |
Increase (decrease) in estimated transition tax liability | $ (23,300) |  | (40,400) |  |
Undistributed earnings of foreign subsidiary |  |  | 18,000 |  |
Unrecognized that would impact effective tax rate |  |  | 21,200 |  |
Foreign Tax Authority |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  |  | 68,300 |  |
Domestic Tax Authority |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  |  | 38,600 |  |
Net operating loss carryforwards |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating loss carryforward |  | $ (1,504) | 1,145 | (3,793) | $ (4,474)
Net operating loss carryforwards | Foreign Tax Authority |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating loss carryforward |  |  | $ (7,979) | (6,469) |
ACTIVE Network | Net operating loss carryforwards |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Net operating loss carryforward |  |  |  | $ (10,300) |

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