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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes to Goodwill
The changes in goodwill for the years ended December 31, 2025 and 2024 were as follows (in thousands):
Environmental ServicesSafety-Kleen Sustainability SolutionsTotal
Balance at January 1, 2024$1,112,013 $175,723 $1,287,736 
Increase from current period acquisitions186,911 6,457 193,368 
Measurement period adjustments from prior period acquisition218 — 218 
Foreign currency translation(2,938)(1,185)(4,123)
Balance at December 31, 2024$1,296,204 $180,995 $1,477,199 
Measurement period adjustments from prior period acquisitions146 (99)47 
Decrease from disposition of business(1)
(538)— (538)
Foreign currency translation1,666 676 2,342 
Balance at December 31, 2025$1,297,478 $181,572 $1,479,050 
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(1)In 2025, the Company sold a non-core business unit. The transaction was immaterial to the financial statements.
Schedule of Finite-Lived Intangible Assets by Major Class
As of December 31, 2025 and 2024, the Company's intangible assets consisted of the following (in thousands):
 December 31, 2025December 31, 2024
 CostAccumulated
Amortization		NetCostAccumulated
Amortization		Net
Permits$196,224 $132,308 $63,916 $191,921 $123,939 $67,982 
Customer and supplier relationships
698,381 292,813 405,568 697,326 256,657 440,669 
Other intangible assets121,030 57,438 63,592 120,316 46,490 73,826 
Total amortizable permits and other intangible assets
1,015,635 482,559 533,076 1,009,563 427,086 582,477 
Trademarks and trade names119,951 — 119,951 119,510 — 119,510 
Total permits and other intangible assets
$1,135,586 $482,559 $653,027 $1,129,073 $427,086 $701,987 
Schedule of Indefinite-Lived Intangible Assets
As of December 31, 2025 and 2024, the Company's intangible assets consisted of the following (in thousands):
 December 31, 2025December 31, 2024
 CostAccumulated
Amortization		NetCostAccumulated
Amortization		Net
Permits$196,224 $132,308 $63,916 $191,921 $123,939 $67,982 
Customer and supplier relationships
698,381 292,813 405,568 697,326 256,657 440,669 
Other intangible assets121,030 57,438 63,592 120,316 46,490 73,826 
Total amortizable permits and other intangible assets
1,015,635 482,559 533,076 1,009,563 427,086 582,477 
Trademarks and trade names119,951 — 119,951 119,510 — 119,510 
Total permits and other intangible assets
$1,135,586 $482,559 $653,027 $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 December 31, 2025 was as follows (in thousands):
Years ending December 31,Expected
Amortization
2026$52,443 
202750,364 
202848,998 
202947,920 
203037,426 
Thereafter295,925 
$533,076