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v3.22.1

REVENUES (Tables) | 3 Months Ended
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Mar. 31, 2022
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following tables present the Company's third-party revenue disaggregated by source of revenue and geography (in thousands):
|  | For the Three Months Ended March 31, 2022
|  | Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 834,678 |  |  | $ | 202,530 |  |  | $ | 72 |  |  | $ | 1,037,280 |
Canada |  | 106,120 |  |  | 25,709 |  |  | — |  |  | 131,829 |
Total third-party revenues |  | $ | 940,798 |  |  | $ | 228,239 |  |  | $ | 72 |  |  | $ | 1,169,109 |
Sources of Revenue |  |  |  |  |  |  |  |
Technical Services |  | $ | 323,656 |  |  | $ | — |  |  | $ | — |  |  | $ | 323,656 |
Field and Emergency Response Services (1) |  | 132,359 |  |  | — |  |  | — |  |  | 132,359 |
Industrial Services and Other (2) |  | 308,838 |  |  | — |  |  | 72 |  |  | 308,910 |
Safety-Kleen Environmental Services |  | 175,945 |  |  | 44,388 |  |  | — |  |  | 220,333 |
Safety-Kleen Oil |  | — |  |  | 183,851 |  |  | — |  |  | 183,851 |
Total third-party revenues |  | $ | 940,798 |  |  | $ | 228,239 |  |  | $ | 72 |  |  | $ | 1,169,109 |
_____________ (1) Includes approximately $28.0 million of third-party revenues from the operations of the HydroChemPSC business (2) Includes approximately $156.1 million of third-party revenues from the operations of the HydroChemPSC business
|  | For the Three Months Ended March 31, 2021
|  | Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 575,508 |  |  | $ | 138,990 |  |  | $ | 79 |  |  | $ | 714,577 |
Canada |  | 77,370 |  |  | 16,201 |  |  | — |  |  | 93,571 |
Total third-party revenues |  | $ | 652,878 |  |  | $ | 155,191 |  |  | $ | 79 |  |  | $ | 808,148 |
Sources of Revenue |  |  |  |  |  |  |  |
Technical Services |  | $ | 272,040 |  |  | $ | — |  |  | $ | — |  |  | $ | 272,040 |
Field and Emergency Response Services |  | 105,168 |  |  | — |  |  | — |  |  | 105,168 |
Industrial Services and Other |  | 119,810 |  |  | — |  |  | 79 |  |  | 119,889 |
Safety-Kleen Environmental Services |  | 155,860 |  |  | 38,978 |  |  | — |  |  | 194,838 |
Safety-Kleen Oil |  | — |  |  | 116,213 |  |  | — |  |  | 116,213 |
Total third-party revenues |  | $ | 652,878 |  |  | $ | 155,191 |  |  | $ | 79 |  |  | $ | 808,148 |
Schedule of Contract Balances |
(in thousands) |  | March 31, 2022 |  | December 31, 2021
Receivables |  | $ | 900,273 |  |  | $ | 792,734 |
Contract assets (unbilled receivables) |  | 123,945 |  |  | 94,963 |
Contract liabilities (deferred revenue) |  | 90,116 |  |  | 83,749 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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