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| | | <Role> http://www.cleanharbors.com/role/GoodwillAndOtherIntangibleAssetsTables </Role> |
| | | <ShortName> GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) </ShortName> |
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| | | <ShortName> ACCRUED EXPENSES (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/AccruedExpenses </ParentRole> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> CLOSURE AND POST-CLOSURE LIABILITIES (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> REMEDIAL LIABILITIES (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/RemedialLiabilities </ParentRole> |
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| | | <ShortName> FINANCING ARRANGEMENTS (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/FinancingArrangements </ParentRole> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> INCOME TAXES (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/IncomeTaxes </ParentRole> |
| | | <Position> 43 </Position> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> EARNINGS PER SHARE (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/EarningsPerShare </ParentRole> |
| | | <Position> 44 </Position> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/AccumulatedOtherComprehensiveLoss </ParentRole> |
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| | | <ShortName> STOCK-BASED COMPENSATION (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> COMMITMENTS AND CONTINGENCIES (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/CommitmentsAndContingencies </ParentRole> |
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| | | <LongName> 2320301 - Disclosure - LEASES (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> LEASES (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/LeasesLeases </ParentRole> |
| | | <Position> 48 </Position> |
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| | | <LongName> 2321301 - Disclosure - SEGMENT REPORTING (Tables) </LongName> |
| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> SEGMENT REPORTING (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/SegmentReporting </ParentRole> |
| | | <Position> 49 </Position> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> QUARTERLY DATA (UNAUDITED) (Tables) </ShortName> |
| | | <MenuCategory> Tables </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/QuarterlyDataUnaudited </ParentRole> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> SIGNIFICANT ACCOUNTING POLICIES (Cash, Cash Equivalents and Uncashed Checks) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/SignificantAccountingPoliciesTables </ParentRole> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> SIGNIFICANT ACCOUNTING POLICIES (Marketable Securities) (Details) </ShortName> |
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| | | <ParentRole> http://www.cleanharbors.com/role/SignificantAccountingPoliciesTables </ParentRole> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> SIGNIFICANT ACCOUNTING POLICIES (Property, Plant and Equipment, net) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/SignificantAccountingPoliciesTables </ParentRole> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> SIGNIFICANT ACCOUNTING POLICIES (Goodwill and Intangible Assets) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/SignificantAccountingPoliciesTables </ParentRole> |
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| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cleanharbors.com/role/SignificantAccountingPoliciesLandfillAccountingDetails </Role> |
| | | <ShortName> SIGNIFICANT ACCOUNTING POLICIES (Landfill Accounting) (Details) </ShortName> |
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| | | <ParentRole> http://www.cleanharbors.com/role/SignificantAccountingPoliciesTables </ParentRole> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> SIGNIFICANT ACCOUNTING POLICIES (Remedial Liabilities) (Details) </ShortName> |
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| | | <ParentRole> http://www.cleanharbors.com/role/SignificantAccountingPoliciesTables </ParentRole> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <ShortName> SIGNIFICANT ACCOUNTING POLICIES (Advertising Expense) (Details) </ShortName> |
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| | | <ParentRole> http://www.cleanharbors.com/role/SignificantAccountingPoliciesTables </ParentRole> |
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| | | <ShortName> REVENUES (Disaggregation of Revenue) (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/RevenuesTables </ParentRole> |
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| | | <MenuCategory> Details </MenuCategory> |
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| | | <ParentRole> http://www.cleanharbors.com/role/BusinessCombinationsTables </ParentRole> |
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| | | <MenuCategory> Details </MenuCategory> |
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| | | <ShortName> BUSINESS COMBINATIONS (Assets Acquired and Liabilities Assumed) (Details) </ShortName> |
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| | | <ReportType> Sheet </ReportType> |
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| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/DispositionOfBusiness </ParentRole> |
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| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cleanharbors.com/role/InventoriesAndSuppliesDetails </Role> |
| | | <ShortName> INVENTORIES AND SUPPLIES (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/InventoriesAndSuppliesTables </ParentRole> |
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| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://www.cleanharbors.com/role/PropertyPlantAndEquipmentDetails </Role> |
| | | <ShortName> PROPERTY, PLANT, AND EQUIPMENT (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://www.cleanharbors.com/role/PropertyPlantAndEquipmentTables </ParentRole> |
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