REVENUES (Tables)

3 Months Ended

Mar. 31, 2025

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):

	Three Months Ended March 31, 2025
	Environmental Services		Safety-Kleen Sustainability Solutions		Corporate		Total
Primary Geographical Markets
United States	$	1,116,267	$	200,019	$	97	$	1,316,383
Canada	90,771		24,796		—		115,567
Total third-party revenues	$	1,207,038	$	224,815	$	97	$	1,431,950
Sources of Revenue
Technical Services	$	426,205	$	—	$	—	$	426,205
Industrial Services and Other	322,358		—		97		322,455
Field and Emergency Response Services	215,702		—		—		215,702
Safety-Kleen Environmental Services	242,773		64,901		—		307,674
Safety-Kleen Oil	—		159,914		—		159,914
Total third-party revenues	$	1,207,038	$	224,815	$	97	$	1,431,950

	Three Months Ended March 31, 2024
	Environmental Services		Safety-Kleen Sustainability Solutions		Corporate		Total
Primary Geographical Markets
United States	$	1,053,458	$	193,912	$	102	$	1,247,472
Canada	107,821		21,402		—		129,223
Total third-party revenues	$	1,161,279	$	215,314	$	102	$	1,376,695
Sources of Revenue
Technical Services	$	407,491	$	—	$	—	$	407,491
Industrial Services and Other	359,397		—		102		359,499
Field and Emergency Response Services	163,469		—		—		163,469
Safety-Kleen Environmental Services	230,922		53,021		—		283,943
Safety-Kleen Oil	—		162,293		—		162,293
Total third-party revenues	$	1,161,279	$	215,314	$	102	$	1,376,695

Schedule of Contract Balances

(in thousands)	March 31, 2025		December 31, 2024
Receivables	$	1,077,510	$	1,015,357
Contract assets (unbilled receivables)	171,089		162,215
Contract liabilities (deferred revenue)	96,171		88,545