REMEDIAL LIABILITIES - Changes to Remedial Liabilities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	$ 111,745
Measurement period adjustment from a prior period acquisition	(90)
Accretion	2,859
Changes in estimates recorded to consolidated statement of operations	(9,777)
Expenditures	(7,494)
Currency translation and other	74
Ending balance	97,317
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	1,948
Measurement period adjustment from a prior period acquisition	0
Accretion	70
Changes in estimates recorded to consolidated statement of operations	(72)
Expenditures	(35)
Currency translation and other	0
Ending balance	1,911
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	57,036
Measurement period adjustment from a prior period acquisition	0
Accretion	1,763
Changes in estimates recorded to consolidated statement of operations	76
Expenditures	(3,082)
Currency translation and other	86
Ending balance	55,879
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	52,761
Measurement period adjustment from a prior period acquisition	(90)
Accretion	1,026
Changes in estimates recorded to consolidated statement of operations	(9,781)
Expenditures	(4,377)
Currency translation and other	(12)
Ending balance	$ 39,527