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REVENUES | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
REVENUES | REVENUES Disaggregation of Revenue We disaggregate the Company’s third-party revenues by geographic location and source of revenue as we believe these categories depict how revenue and cash flows are affected by economic factors (in thousands):
|  | For the year ended December 31, 2020
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 1,690,256 |  |  | $ | 1,049,975 |  |  | $ | (674) |  |  | $ | 2,739,557 |
Canada |  | 313,825 |  |  | 89,751 |  |  | 964 |  |  | 404,540 |
Total third-party revenues |  | $ | 2,004,081 |  |  | $ | 1,139,726 |  |  | $ | 290 |  |  | $ | 3,144,097 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 1,062,714 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,062,714 |
Field and Emergency Response Services |  | 461,036 |  |  | — |  |  | — |  |  | 461,036 |
Industrial Services and Other |  | 480,331 |  |  | — |  |  | 290 |  |  | 480,621 |
Safety-Kleen Environmental Services |  | — |  |  | 809,236 |  |  | — |  |  | 809,236 |
Safety-Kleen Oil |  | — |  |  | 330,490 |  |  | — |  |  | 330,490 |
Total third-party revenues |  | $ | 2,004,081 |  |  | $ | 1,139,726 |  |  | $ | 290 |  |  | $ | 3,144,097 |
|  | For the year ended December 31, 2019
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 1,721,322 |  |  | $ | 1,220,096 |  |  | $ | (586) |  |  | $ | 2,940,832 |
Canada |  | 371,041 |  |  | 98,595 |  |  | 1,722 |  |  | 471,358 |
Total third-party revenues |  | $ | 2,092,363 |  |  | $ | 1,318,691 |  |  | $ | 1,136 |  |  | $ | 3,412,190 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 1,120,043 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,120,043 |
Field and Emergency Response Services |  | 340,906 |  |  | — |  |  | — |  |  | 340,906 |
Industrial Services and Other (2) |  | 631,414 |  |  | — |  |  | 1,136 |  |  | 632,550 |
Safety-Kleen Environmental Services |  | — |  |  | 851,520 |  |  | — |  |  | 851,520 |
Safety-Kleen Oil |  | — |  |  | 467,171 |  |  | — |  |  | 467,171 |
Total third-party revenues |  | $ | 2,092,363 |  |  | $ | 1,318,691 |  |  | $ | 1,136 |  |  | $ | 3,412,190 |
|  | For the year ended December 31, 2018
|  | Environmental Services |  | Safety-Kleen |  | Corporate |  | Total
Primary Geographical Markets |  |  |  |  |  |  |  |
United States |  | $ | 1,598,402 |  |  | $ | 1,196,661 |  |  | $ | 1,082 |  |  | $ | 2,796,145 |
Canada |  | 405,441 |  |  | 98,694 |  |  | 23 |  |  | 504,158 |
Total third-party revenues |  | $ | 2,003,843 |  |  | $ | 1,295,355 |  |  | $ | 1,105 |  |  | $ | 3,300,303 |
Sources of Revenue (1) |  |  |  |  |  |  |  |
Technical Services |  | $ | 1,037,388 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,037,388 |
Field and Emergency Response Services |  | 304,727 |  |  | — |  |  | — |  |  | 304,727 |
Industrial Services and Other (3) |  | 661,728 |  |  | — |  |  | 1,105 |  |  | 662,833 |
Safety-Kleen Environmental Services |  | — |  |  | 795,077 |  |  | — |  |  | 795,077 |
Safety-Kleen Oil |  | — |  |  | 500,278 |  |  | — |  |  | 500,278 |
Total third-party revenues |  | $ | 2,003,843 |  |  | $ | 1,295,355 |  |  | $ | 1,105 |  |  | $ | 3,300,303 |
_____________________ (1)All revenue except oil and oil product sales within Safety-Kleen Oil and product sales within Safety-Kleen Environmental Services, which include various automotive related fluids, shop supplies and direct blended oil sales, are recognized over time. Safety-Kleen Oil and Safety-Kleen Environmental Services product sales are recognized at a point in time. (2)Environmental Services third-party revenues of $117.0 million and Corporate third party revenues of $1.1 million previously reported as Oil, Gas and Lodging Services and Other for the year ended December 31, 2019 are now reported within Industrial Services and Other based on relative materiality to the business. (3)Environmental Services third-party revenues of $119.8 million and Corporate third party revenues of $1.1 million previously reported as Oil, Gas and Lodging Services and Other for the year ended December 31, 2018 are now reported within Industrial Services and Other based on relative materiality to the business. Contract Balances
(in thousands) |  | December 31, 2020 |  | December 31, 2019 |  |
Receivables |  | $ | 611,534 |  |  | $ | 644,738 |  |  |
Contract assets (unbilled receivables) |  | 55,681 |  |  | 56,326 |  |  |
Contract liabilities (deferred revenue) |  | 74,066 |  |  | 73,370 |  |  |
The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets) and customer advances and deposits or deferred revenue (contract liabilities) on the consolidated balance sheet. Generally, billing occurs subsequent to revenue recognition, as a right to payment is not just subject to passage of time, resulting in contract assets. Contract assets are generally classified as current. The Company sometimes receives advances or deposits from its customers before revenue is recognized, resulting in contract liabilities. These assets and liabilities are reported on the consolidated balance sheet on a contract-by-contract basis at the end of each reporting period. The contract liability balances at the beginning of each period presented were generally fully recognized in the subsequent three-month period. Variable Consideration The nature of the Company's contracts give rise to certain types of variable consideration, including in limited cases volume discounts. Accordingly, management establishes a revenue allowance to cover the estimated amounts of revenue that may need to be credited to customers' accounts in future periods. The Company estimates the amount of variable consideration to include in the estimated transaction price based on historical experience, anticipated performance and management's best judgment at the time and to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. Contract Costs Contract costs include direct and incremental costs to obtain or fulfill a contract. Parts washer costs include costs of solvent, commissions paid relating to revenue generated from parts washer services, and transportation costs associated with transferring the product picked up from the services as it is returned to the Company’s facilities or a third-party site. Costs related to the treatment of waste include costs for waste receiving, drum movement and storage, waste consolidation and transportation between facilities. The Company’s contract costs that are subject to capitalization are comprised of costs associated with parts washer services and costs associated with the treatment and disposal of waste. As of December 31, 2020 and 2019, the Company's deferred contract costs totaled $22.8 million and $21.7 million, respectively. Deferred parts washer costs are recognized over the service interval as the customer receives the benefit of the services, and deferred costs related to treatment and disposal of waste are recognized when the corresponding waste is disposed. Deferred costs are included within total current assets in the Company’s consolidated balance sheets. The deferred contract cost balances at the beginning of each period presented were fully recognized in cost of revenue in the subsequent three-month period.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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