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Employee Benefit Plans (Plan Contributions) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 15, 2014
employee
Multiemployer Plans [Line Items]        
Company contributions $ 4,078us-gaap_MultiemployerPlanPeriodContributions $ 3,885us-gaap_MultiemployerPlanPeriodContributions $ 3,812us-gaap_MultiemployerPlanPeriodContributions  
Western Conference of Teamsters Pension Trust [Member]        
Multiemployer Plans [Line Items]        
EIN/Pension plan number 916145047      
Pension Protection Act zone status Green [1] Green [1]    
Company contributions 226us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= wcn_WesternConferenceOfTeamstersPensionTrustMember
3,662us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= wcn_WesternConferenceOfTeamstersPensionTrustMember
3,591us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= wcn_WesternConferenceOfTeamstersPensionTrustMember
 
Collective-bargaining agreement, expiration date Dec. 15, 2014      
Collective-bargaining agreement, expiration date, start Dec. 15, 2014 [2]      
Collective-bargaining agreement, expiration date, end Dec. 31, 2019 [2]      
Employees represented by collective bargaining agreement       54wcn_MultiemployerPlansCollectiveBargainingArrangementNumberOfParticipants
/ us-gaap_MultiemployerPlanNameAxis
= wcn_WesternConferenceOfTeamstersPensionTrustMember
Locals 302 & 612 of the IOUE - Employers Construction Industry Retirement Plan [Member]        
Multiemployer Plans [Line Items]        
EIN/Pension plan number 916028571      
Pension Protection Act zone status Green [1] Green [1]    
Company contributions $ 3,852us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= wcn_Locals302612OfIoueEmployersConstructionIndustryRetirementPlanMember
$ 223us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= wcn_Locals302612OfIoueEmployersConstructionIndustryRetirementPlanMember
$ 221us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= wcn_Locals302612OfIoueEmployersConstructionIndustryRetirementPlanMember
 
Collective-bargaining agreement, expiration date Sep. 30, 2016      
[1] The most recent Pension Protection Act zone status available in 2014 and 2013 is for the plans’ years ended December 31, 2013 and 2012, respectively.
[2] There is one collective bargaining agreement, representing a total of 54 employees, which expired on December 15, 2014, and is currently being negotiated for extension.