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Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2025
Oct. 10, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2025  
Document Fiscal Year Focus 2025  
Document Transition Report false  
Securities Act File Number 1-34370  
Entity Registrant Name WASTE CONNECTIONS, INC.  
Entity Incorporation, State or Country Code A6  
Entity Tax Identification Number 98-1202763  
Entity Address, Address Line One 6220 Hwy 7  
Entity Address, Address Line Two Suite 600  
Entity Address, City or Town Woodbridge  
Entity Address, State or Province ON  
Entity Address, Country CA  
Entity Address, Postal Zip Code L4H 4G3  
City Area Code 905  
Local Phone Number 532-7510  
Title of 12(b) Security Common Shares, no par value  
Trading Symbol WCN  
Security Exchange Name NYSE  
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 Common Stock, Shares Outstanding   256,023,511
Entity Central Index Key 0001318220  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q3  
Amendment Flag false