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SEGMENT REPORTING - Third Party Revenues to Direct Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 891,668 | $ 843,181 | $ 2,541,185 | $ 2,442,099
Corporate Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 129 | 467 | 925 | 1,148
Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (1,478) | (1,151) | (3,316) | (2,574)
Operating and Corporate non-segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (1,349) | (684) | (2,391) | (1,426)
Environmental Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 586,872 | 542,980 | 1,658,970 | 1,570,241
Environmental Services | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 550,122 | 508,813 | 1,550,114 | 1,468,417
Environmental Services | Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 35,274 | 33,022 | 105,555 | 99,278
Environmental Services | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,476 | 1,145 | 3,301 | 2,546
Safety-Kleen |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 306,145 | 300,885 | 884,606 | 873,284
Safety-Kleen | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 341,417 | 333,901 | 990,146 | 972,534
Safety-Kleen | Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (35,274) | (33,022) | (105,555) | (99,278)
Safety-Kleen | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 2 | $ 6 | $ 15 | $ 28

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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