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SEGMENT REPORTING - Third Party Revenues to Direct Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 868,678 | $ 849,140 | $ 1,649,517 | $ 1,598,918
Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 868,678 | 849,140 | 1,649,517 | 1,598,918
Environmental Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 526,294 | 519,916 | 999,992 | 959,604
Environmental Services | Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 36,206 | 34,291 | 70,281 | 66,256
Environmental Services | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 576 | 607 | 1,825 | 1,401
Environmental Services | Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 563,076 | 554,814 | 1,072,098 | 1,027,261
Safety-Kleen |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 342,182 | 328,715 | 648,729 | 638,633
Safety-Kleen | Intersegment revenues, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (36,206) | (34,291) | (70,281) | (66,256)
Safety-Kleen | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 8 | 11 | 13 | 22
Safety-Kleen | Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 305,984 | 294,435 | 578,461 | 572,399
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 202 | 509 | 796 | 681
Corporate | Corporate Items, net |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (584) | (618) | (1,838) | (1,423)
Corporate | Direct revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ (382) | $ (109) | $ (1,042) | $ (742)

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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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