GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes to Goodwill

The changes in goodwill for the years ended December 31, 2022 and 2021 were as follows (in thousands):

	Environmental Services		Safety-Kleen Sustainability Solutions		Totals
Balance at January 1, 2021	$	401,918	$	125,105	$	527,023
Increase from current period acquisitions	683,463		16,349		699,812
Foreign currency translation	153		54		207
Balance at December 31, 2021	$	1,085,534	$	141,508	$	1,227,042
Increase from current period acquisitions	—		34,510		34,510
Measurement period adjustments from prior period acquisition	(6,762)		—		(6,762)
Decrease from disposition of business	(4,412)		—		(4,412)
Foreign currency translation	(2,514)		(986)		(3,500)
Balance at December 31, 2022	$	1,071,846	$	175,032	$	1,246,878

Schedule of Finite-Lived Intangible Assets by Major Class

As of December 31, 2022 and 2021, the Company's finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):

	December 31, 2022						December 31, 2021
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	188,373	$	109,036	$	79,337	$	187,519	$	102,408	$	85,111
Customer and supplier relationships	583,709		229,368		354,341		576,474		214,776		361,698
Other intangible assets	89,388		24,818		64,570		94,271		19,359		74,912
Total amortizable permits and other intangible assets	861,470		363,222		498,248		858,264		336,543		521,721
Trademarks and trade names	122,534		—		122,534		123,191		—		123,191
Total permits and other intangible assets	$	984,004	$	363,222	$	620,782	$	981,455	$	336,543	$	644,912

Schedule of Indefinite-Lived Intangible Assets

As of December 31, 2022 and 2021, the Company's finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):

	December 31, 2022						December 31, 2021
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	188,373	$	109,036	$	79,337	$	187,519	$	102,408	$	85,111
Customer and supplier relationships	583,709		229,368		354,341		576,474		214,776		361,698
Other intangible assets	89,388		24,818		64,570		94,271		19,359		74,912
Total amortizable permits and other intangible assets	861,470		363,222		498,248		858,264		336,543		521,721
Trademarks and trade names	122,534		—		122,534		123,191		—		123,191
Total permits and other intangible assets	$	984,004	$	363,222	$	620,782	$	981,455	$	336,543	$	644,912

Schedule of Expected Amortization for the Net Carrying Amount of Finite Lived Intangible Assets

The expected amortization of the net carrying amount of finite-lived intangible assets at December 31, 2022 is as follows (in thousands):

Years ending December 31,	Expected Amortization
2023	$	46,030
2024	41,814
2025	39,828
2026	37,943
2027	35,869
Thereafter	296,764
	$	498,248