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REVENUES (Tables)
 12 Months Ended
Dec. 31, 2021
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 year ended December 31, 2021
Environmental ServicesSafety-Kleen Sustainability SolutionsCorporateTotal
Primary Geographical Markets
United States$2,631,112 $693,542 $299 $3,324,953 
Canada394,795 85,818 — 480,613 
Total third-party revenues$3,025,907 $779,360 $299 $3,805,566 
Sources of Revenue
Technical Services$1,209,624 $— $— $1,209,624 
Field and Emergency Response Services (1)
466,380 — — 466,380 
Industrial Services and Other (2)
705,999 — 299 706,298 
Safety-Kleen Environmental Services643,904 161,587 — 805,491 
Safety-Kleen Oil— 617,773 — 617,773 
Total third-party revenues$3,025,907 $779,360 $299 $3,805,566 
_____________
(1) Includes $28.4 million of third-party revenues generated from the operations of the HydroChemPSC business
(2) Includes $137.7 million of third-party revenues generated from the operations of the HydroChemPSC business
For the year ended December 31, 2020
Environmental ServicesSafety-Kleen Sustainability SolutionsCorporateTotal
Primary Geographical Markets
United States$2,287,796 $452,435 $(674)$2,739,557 
Canada349,845 53,731 964 404,540 
Total third-party revenues$2,637,641 $506,166 $290 $3,144,097 
Sources of Revenue
Technical Services$1,062,714 $— $— $1,062,714 
Field and Emergency Response Services461,036 — — 461,036 
Industrial Services and Other480,331 — 290 480,621 
Safety-Kleen Environmental Services633,560 175,676 — 809,236 
Safety-Kleen Oil— 330,490 — 330,490 
Total third-party revenues$2,637,641 $506,166 $290 $3,144,097 

For the year ended December 31, 2019
Environmental ServicesSafety-Kleen Sustainability SolutionsCorporateTotal
Primary Geographical Markets
United States$2,390,718 $550,700 $(586)$2,940,832 
Canada411,964 57,672 1,722 471,358 
Total third-party revenues$2,802,682 $608,372 $1,136 $3,412,190 
Sources of Revenue
Technical Services$1,120,043 $— $— $1,120,043 
Field and Emergency Response Services340,906 — — 340,906 
Industrial Services and Other631,414 — 1,136 632,550 
Safety-Kleen Environmental Services710,319 141,201 — 851,520 
Safety-Kleen Oil— 467,171 — 467,171 
Total third-party revenues$2,802,682 $608,372 $1,136 $3,412,190 
Schedule of Contract Balances
Contract Balances
(in thousands)December 31, 2021December 31, 2020
Receivables$792,734 $611,534 
Contract assets (unbilled receivables)94,963 55,681 
Contract liabilities (deferred revenue)83,749 74,066