XML 62 R41.htm IDEA: XBRL DOCUMENT v3.25.4

CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

12 Months Ended

Dec. 31, 2025

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Closure and Post-Closure Liabilities

The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2024 through December 31, 2025 were as follows (in thousands):

			Landfill Retirement Liability						Non-Landfill Retirement Liability						Total
Balance at January 1, 2024			$	59,443					$	59,157					$	118,600
Liabilities assumed in acquisitions			—						11,421						11,421
New asset retirement obligations			2,118						—						2,118
Accretion			5,069						4,489						9,558
Changes in estimates recorded to consolidated statement of operations			70						(295)						(225)
Changes in estimates recorded to consolidated balance sheet			4,335						402						4,737
Environmental expenditures			(11,210)						(4,466)						(15,676)
Currency translation and other			(425)						(320)						(745)
Balance at December 31, 2024			59,400						70,388						129,788
Measurement period adjustments from prior period acquisitions			—						420						420
New asset retirement obligations			3,839						—						3,839
Accretion			5,013						5,552						10,565
Changes in estimates recorded to consolidated statement of operations			446						(332)						114
Changes in estimates recorded to consolidated balance sheet			(4,410)						906						(3,504)
Environmental expenditures			(4,719)						(1,446)						(6,165)
Currency translation and other			194						77						271
Balance at December 31, 2025			$	59,763					$	75,565					$	135,328

Schedule of Expected Payments Related to Asset Retirement Obligations

Anticipated payments (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on closure and post-closure activities) for each of the next five years and thereafter are as follows (in thousands):

Years ending December 31,
2026			$	10,290
2027			13,906
2028			20,063
2029			8,738
2030			1,723
Thereafter			294,466
Undiscounted closure and post-closure liabilities			349,186
Less: Discount at credit-adjusted risk-free rate			(115,489)
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed			(98,369)
Present value of closure and post-closure liabilities			$	135,328

X

- Definition

Schedule of Expected Payments Related to Asset Retirement Obligations [Table Text Block]

+ References

No definition available.

+ Details

Name:	clh_ScheduleOfExpectedPaymentsRelatedToAssetRetirementObligationsTableTextBlock
Namespace Prefix:	clh_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AssetRetirementObligationDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

+ Details

Name:	us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration