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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
 9 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes to Goodwill
The changes in goodwill by segment for the nine months ended September 30, 2025 were as follows (in thousands):
Environmental ServicesSafety-Kleen Sustainability SolutionsTotals
Balance at January 1, 2025$1,296,204 $180,995 $1,477,199 
Measurement period adjustments from prior period acquisitions146 (99)47 
Foreign currency translation1,130 455 1,585 
Balance at September 30, 2025$1,297,480 $181,351 $1,478,831 
Schedule of Finite-Lived Intangible Assets
As of September 30, 2025 and December 31, 2024, the Company’s intangible assets consisted of the following (in thousands):
September 30, 2025December 31, 2024
CostAccumulated
Amortization		NetCostAccumulated
Amortization		Net
Permits$194,193 $130,053 $64,140 $191,921 $123,939 $67,982 
Customer and supplier relationships
698,036 283,708 414,328 697,326 256,657 440,669 
Other intangible assets
120,404 54,714 65,690 120,316 46,490 73,826 
Total amortizable permits and other intangible assets
1,012,633 468,475 544,158 1,009,563 427,086 582,477 
Trademarks and trade names
119,807 — 119,807 119,510 — 119,510 
Total permits and other intangible assets
$1,132,440 $468,475 $663,965 $1,129,073 $427,086 $701,987 
Schedule of Indefinite-Lived Intangible Assets
As of September 30, 2025 and December 31, 2024, the Company’s intangible assets consisted of the following (in thousands):
September 30, 2025December 31, 2024
CostAccumulated
Amortization		NetCostAccumulated
Amortization		Net
Permits$194,193 $130,053 $64,140 $191,921 $123,939 $67,982 
Customer and supplier relationships
698,036 283,708 414,328 697,326 256,657 440,669 
Other intangible assets
120,404 54,714 65,690 120,316 46,490 73,826 
Total amortizable permits and other intangible assets
1,012,633 468,475 544,158 1,009,563 427,086 582,477 
Trademarks and trade names
119,807 — 119,807 119,510 — 119,510 
Total permits and other intangible assets
$1,132,440 $468,475 $663,965 $1,129,073 $427,086 $701,987 
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 September 30, 2025 was as follows (in thousands):
Years Ending December 31,Expected Amortization
2025 (three months)$13,379 
202651,727 
202749,190 
202847,708 
202942,097 
Thereafter340,057 
$544,158