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SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2025
Accounting Policies [Abstract]  
Schedule of Marketable Securities As of December 31, 2025 and 2024, the Company had total marketable securities as follows (in thousands):
December 31, 2025December 31, 2024
Commercial paper$3,988 $4,035 
Corporate notes and bonds1,601 — 
Total cash equivalents5,589 4,035 
Commercial paper9,942 17,489 
Corporate notes and bonds117,421 85,145 
Total marketable securities127,363 102,634 
Total$132,952 $106,669 
Schedule of Activity in Allowance for Doubtful Accounts
The following table reflects the activity in the allowance for doubtful accounts and revenue allowance (in thousands):
Allowance for Doubtful AccountsRevenue Allowance
202520242023202520242023
Balance at January 1,$22,908 $22,568 $24,659 $24,334 $19,641 $20,594 
Additions charged to earnings8,079 8,129 5,956 45,021 48,301 46,467 
Deductions from reserves, net of recoveries(9,831)(7,789)(8,047)(54,520)(43,608)(47,420)
Balance at December 31,$21,156 $22,908 $22,568 $14,835 $24,334 $19,641 
Schedule of Activity in Revenue Allowance
The following table reflects the activity in the allowance for doubtful accounts and revenue allowance (in thousands):
Allowance for Doubtful AccountsRevenue Allowance
202520242023202520242023
Balance at January 1,$22,908 $22,568 $24,659 $24,334 $19,641 $20,594 
Additions charged to earnings8,079 8,129 5,956 45,021 48,301 46,467 
Deductions from reserves, net of recoveries(9,831)(7,789)(8,047)(54,520)(43,608)(47,420)
Balance at December 31,$21,156 $22,908 $22,568 $14,835 $24,334 $19,641 
Schedule of Asset Classification and Estimated Useful Life
The Company depreciates and amortizes the capitalized cost of these assets, using the straight-line method as follows:
Asset ClassificationEstimated Useful Life
Buildings and building improvements 
Buildings
20-42 years
Leasehold and building improvements
2-45 years
Vehicles
2-15 years
Equipment 
Capitalized software and computer equipment
3-5 years
Containers and railcars
8-16 years
All other equipment
4-30 years
Furniture and fixtures
5-8 years
Property, plant and equipment consisted of the following (in thousands):
December 31, 2025December 31, 2024
Land$193,438 $184,191 
Asset retirement costs (non-landfill)40,232 38,705 
Landfill assets278,700 258,138 
Buildings and improvements (1)
753,404 719,439 
Vehicles (2)
1,583,387 1,455,530 
Equipment (3)
2,652,027 2,600,085 
Construction in progress90,182 70,305 
5,591,370 5,326,393 
Less - accumulated depreciation and amortization3,050,303 2,878,452 
Total property, plant and equipment, net$2,541,067 $2,447,941 
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(1) Balances inclusive of gross ROU assets classified as finance leases of $8.0 million in both periods.
(2) Balances inclusive of gross ROU assets classified as finance leases of $294.2 million and $230.5 million, respectively.
(3) Balances inclusive of gross ROU assets classified as finance leases of $17.4 million and $9.2 million, respectively.
Schedule of Active Landfill Sites
As of December 31, 2025, the Company had eight active landfill sites (including the Company's non-commercial landfill), which have estimated remaining lives (based on anticipated waste volumes and the remaining highly probable airspace) as follows:
Facility NameLocationRemaining
Lives
(Years)		Permitted Remaining Highly Probable Airspace
(cubic yards) (in thousands)
ButtonwillowCalifornia174,597 
Deer TrailColorado161,271 
Grassy MountainUtah364,133 
KimballNebraska21496 
LambtonOntario, Canada413,983 
Lone MountainOklahoma5213,528 
RyleyAlberta, Canada475,475 
SawyerNorth Dakota593,136 
  36,619 
Schedule of Remaining Highly Probable Airspace
The following table presents the remaining highly probable airspace from January 1, 2024 through December 31, 2025 (in thousands of cubic yards):
20252024
Remaining capacity, beginning of year26,951 27,753 
Changes in highly probable airspace, net10,909 — 
Consumed(1,241)(802)
Remaining capacity, end of year36,619 26,951