GUARANTOR AND NON-GUARANTOR SUBSIDIARIES (Narrative) (Details)	12 Months Ended
Dec. 31, 2018
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]
Guarantor, ownership interest by Clean Harbors, Inc.	100.00%

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

No definition available.

Name:	us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration