XML 35 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Feb. 19, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-34223    
Entity Registrant Name CLEAN HARBORS, INC    
Entity Incorporation, State or Country Code MA    
Entity Tax Identification Number 04-2997780    
Entity Address, Address Line One 42 Longwater Drive    
Entity Address, City or Town Norwell    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02061-9149    
City Area Code 781    
Local Phone Number 792-5000    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol CLH    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 3.7
Entity Common Stock, Shares Outstanding   55,829,761  
Documents Incorporated by Reference
Certain portions of the registrant's definitive proxy statement for its 2020 annual meeting of stockholders (which will be filed with the Commission not later than April 22, 2020) are incorporated by reference into Part III of this report.
    
Entity Central Index Key 0000822818    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false