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BUSINESS COMBINATIONS - 2018 Acquisitions (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2018 | Feb. 23, 2018 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |
Goodwill recognized |  |  |  | $ 12,739 |
Acquired Company Included in Safety-Kleen and Environmental Services Segments |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill recognized | $ 12,300 |  |  |  |
Purchase price | $ 26,700 |  |  |  |
Veolia Division |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price |  | $ 124,500 |  |  |
Weighted average amortization period (in years) |  | 8 years 2 months 12 days |  |  |
Pre-tax (loss) income |  |  | $ (800) |  | $ 2,500

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