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SEGMENT REPORTING (Segment Information, Revenues, EBITA, and Reconciliation to the Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 871,005 | $ 891,668 | $ 868,678 | $ 780,839 | $ 858,204 | $ 843,181 | $ 849,140 | $ 749,778 | $ 3,412,190 | $ 3,300,303 | $ 2,944,978
Adjusted EBITDA |  |  |  |  |  |  |  |  | 540,317 | 491,005 | 425,657
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Accretion of environmental liabilities |  |  |  |  |  |  |  |  | 10,136 | 9,806 | 9,460
Depreciation and amortization |  |  |  |  |  |  |  |  | 300,725 | 298,625 | 288,422
(Loss) income from operations | 52,307 | 80,367 | 73,048 | 23,734 | 41,485 | 65,745 | 64,353 | 10,991 | 229,456 | 182,574 | 127,775
Other (income) expense, net | (905) | 427 | $ 564 | $ (2,983) | 4,061 | 996 | $ (846) | $ 299 | (2,897) | 4,510 | 6,119
Loss on early extinguishment of debt |  | $ 6,100 |  |  |  | $ 2,500 |  |  | 6,131 | 2,488 | 7,891
Gain on sale of businesses |  |  |  |  |  |  |  |  | (687) | 0 | (30,732)
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 78,670 | 81,094 | 85,808
(Loss) income before (benefit) provision for income taxes |  |  |  |  |  |  |  |  | 148,239 | 94,482 | 58,689
Assets | 4,108,904 |  |  |  | 3,738,321 |  |  |  | 4,108,904 | 3,738,321 |
Property, plant and equipment, net |  |  |  |  | 1,561,978 |  |  |  |  | 1,561,978 |
Property, plant and equipment, net | 1,588,151 |  |  |  |  |  |  |  | 1,588,151 |  |
Goodwill | 525,013 |  |  |  | 514,189 |  |  |  | 525,013 | 514,189 | 478,523
Permits and other intangibles, net | 419,066 |  |  |  | 441,875 |  |  |  | 419,066 | 441,875 |
Permits and other intangibles, net | 944,079 |  |  |  | 956,064 |  |  |  | 944,079 | 956,064 |
Environmental Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,237,068 | 2,141,194 | 1,857,474
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Goodwill | 212,531 |  |  |  | 207,019 |  |  |  | 212,531 | 207,019 | 172,386
Safety-Kleen |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,178,129 | 1,161,282 | 1,087,886
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Goodwill | 312,482 |  |  |  | 307,170 |  |  |  | 312,482 | 307,170 | 306,137
Operating segments | Environmental Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,092,363 | 2,003,843 | 1,728,700
Adjusted EBITDA |  |  |  |  |  |  |  |  | 446,284 | 380,856 | 321,310
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  | 951,867 |  |  |  |  | 951,867 |
Property, plant and equipment, net | 939,352 |  |  |  |  |  |  |  | 939,352 |  |
Goodwill | 212,531 |  |  |  | 207,019 |  |  |  | 212,531 | 207,019 |
Permits and other intangibles, net | 89,722 |  |  |  | 93,313 |  |  |  | 89,722 | 93,313 |
Permits and other intangibles, net | 302,253 |  |  |  | 300,332 |  |  |  | 302,253 | 300,332 |
Operating segments | Safety-Kleen |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,318,691 | 1,295,355 | 1,213,703
Adjusted EBITDA |  |  |  |  |  |  |  |  | 282,378 | 282,029 | 249,811
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  | 553,220 |  |  |  |  | 553,220 |
Property, plant and equipment, net | 555,310 |  |  |  |  |  |  |  | 555,310 |  |
Goodwill | 312,482 |  |  |  | 307,170 |  |  |  | 312,482 | 307,170 |
Permits and other intangibles, net | 329,344 |  |  |  | 348,562 |  |  |  | 329,344 | 348,562 |
Permits and other intangibles, net | 641,826 |  |  |  | 655,732 |  |  |  | 641,826 | 655,732 |
Intersegment revenues, net | Environmental Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 140,577 | 134,104 | 125,822
Intersegment revenues, net | Safety-Kleen |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | (140,577) | (134,104) | (125,822)
Corporate Items, net |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | (4,143) | (3,278) | (2,957)
Corporate Items, net | Environmental Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 4,128 | 3,247 | 2,952
Corporate Items, net | Safety-Kleen |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 15 | 31 | 5
Corporate Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,136 | 1,105 | 2,575
Adjusted EBITDA |  |  |  |  |  |  |  |  | (188,345) | (171,880) | (145,464)
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  | $ 56,891 |  |  |  |  | 56,891 |
Property, plant and equipment, net | $ 93,489 |  |  |  |  |  |  |  | 93,489 |  |
Operating segments and corporate non segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ (3,007) | $ (2,173) | $ (382)

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