XML 13 R1.htm IDEA: XBRL DOCUMENT v3.22.0.1
Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2021
Jan. 31, 2022
Jun. 30, 2021
Document Information [Line Items]      
Document Type 10-K    
Entity Registrant Name CASELLA WASTE SYSTEMS, INC.    
Document Annual Report true    
Document Transition Report false    
Entity File Number 000-23211    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 03-0338873    
Entity Address, Address Line One 25 Greens Hill Lane    
Entity Address, City or Town Rutland    
Entity Address, State or Province VT    
Entity Address, Postal Zip Code 05701    
City Area Code (802    
Local Phone Number 775-0325    
Title of 12(b) Security Class A common stock, $0.01 par value per share    
Trading Symbol CWST    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 3.1
Documents Incorporated by Reference Part III of this Annual Report on Form 10-K incorporates by reference information from the definitive Proxy Statement for the registrant’s 2022 Annual Meeting of Stockholders or a Form10-K/A to be filed with the Securities and Exchange Commission not later than 120 days after the registrant’s fiscal year ended December 31, 2021    
Amendment Flag false    
Entity Central Index Key 0000911177    
Class A Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   50,423,232  
Class B Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   988,200