SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disposal Cell Accounting (Details)	12 Months Ended
Dec. 31, 2021
Disposal Cell Accounting
Period of acceptable financial assurance for closure and post-closure monitoring of each facility as per RCRA requirements	30 years

Represents the period of acceptable financial assurance by the entity for closure and post-closure monitoring of each facility, as per Resource Conservation and Recovery Act.

No definition available.

Name:	ecol_PeriodOfFinancialAssuranceForClosureAndPostClosureMonitoringForEachFacility
Namespace Prefix:	ecol_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration