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Long-Term Debt (Long-Term Debt) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total debt $ 1,998,030us-gaap_LongTermDebt $ 1,979,565us-gaap_LongTermDebt
Less - current portion (3,917)us-gaap_LongTermDebtCurrent (3,649)us-gaap_LongTermDebtCurrent
Less - debt issuance costs (10,259)us-gaap_UnamortizedDebtIssuanceExpense (8,396)us-gaap_UnamortizedDebtIssuanceExpense
Long-term debt and notes payable 1,983,854us-gaap_LongTermDebtNoncurrent 1,967,520us-gaap_LongTermDebtNoncurrent
Term Loan Facility [Member]    
Debt Instrument [Line Items]    
Total debt   660,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_TermLoanFacilityMember
Revolver Under Prior Credit Agreement [Member]    
Debt Instrument [Line Items]    
Total debt   680,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_RevolverUnderPriorCreditAgreementMember
Senior Notes due 2015 [Member]    
Debt Instrument [Line Items]    
Total debt 175,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandFifteenMember		 175,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandFifteenMember
Interest rate 6.22%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandFifteenMember		 6.22%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandFifteenMember
Debt instrument maturity date year 2015 2015
Senior Notes due 2016 [Member]    
Debt Instrument [Line Items]    
Total debt 100,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandSixteenMember		 100,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandSixteenMember
Interest rate 3.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandSixteenMember		 3.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandSixteenMember
Debt instrument maturity date year 2016 2016
Senior Notes due 2018 [Member]    
Debt Instrument [Line Items]    
Total debt 50,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandEighteenMember		 50,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandEighteenMember
Interest rate 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandEighteenMember		 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandEighteenMember
Debt instrument maturity date year 2018 2018
Senior Notes due 2019 [Member]    
Debt Instrument [Line Items]    
Total debt 175,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandNineteenMember		 175,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandNineteenMember
Interest rate 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandNineteenMember		 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandNineteenMember
Debt instrument maturity date year 2019 2019
Senior Notes due 2021 [Member]    
Debt Instrument [Line Items]    
Total debt 100,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandTwentyOneMember		 100,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandTwentyOneMember
Interest rate 4.64%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandTwentyOneMember		 4.64%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wcn_NotesTwoThousandTwentyOneMember
Debt instrument maturity date year 2021 2021
Tax-exempt Bonds [Member]    
Debt Instrument [Line Items]    
Total debt 31,430us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_TaxExemptBondsMember		 [1] 31,430us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_TaxExemptBondsMember		 [1]
Interest rate, minimum 0.06%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= wcn_TaxExemptBondsMember		 [1]  
Interest rate, maximum 0.09%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= wcn_TaxExemptBondsMember		 [1]  
2.50% to 10.9% Notes Payable to Sellers and Other Third Parties [Member]    
Debt Instrument [Line Items]    
Total debt 12,600us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_TwoPointFiveZeroPercentToTenPointNinePercentNotesPayableToSellersAndOtherThirdPartiesMember		 [1] 8,135us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= wcn_TwoPointFiveZeroPercentToTenPointNinePercentNotesPayableToSellersAndOtherThirdPartiesMember		 [1]
Interest rate, minimum 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= wcn_TwoPointFiveZeroPercentToTenPointNinePercentNotesPayableToSellersAndOtherThirdPartiesMember		 [1] 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= wcn_TwoPointFiveZeroPercentToTenPointNinePercentNotesPayableToSellersAndOtherThirdPartiesMember		 [1]
Interest rate, maximum 10.90%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= wcn_TwoPointFiveZeroPercentToTenPointNinePercentNotesPayableToSellersAndOtherThirdPartiesMember		 [1] 10.90%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= wcn_TwoPointFiveZeroPercentToTenPointNinePercentNotesPayableToSellersAndOtherThirdPartiesMember		 [1]
Credit Agreement [Member] | Revolver Under Credit Facility [Member]    
Debt Instrument [Line Items]    
Total debt 554,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= wcn_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= wcn_RevolverUnderCreditFacilityMember		 [1]  
Interest rate, minimum 1.37%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= wcn_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= wcn_RevolverUnderCreditFacilityMember		 [1]  
Interest rate, maximum 3.45%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= wcn_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= wcn_RevolverUnderCreditFacilityMember		 [1]  
Credit Agreement [Member] | Term Loan Facility [Member]    
Debt Instrument [Line Items]    
Total debt $ 800,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= wcn_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= wcn_TermLoanFacilityMember		 [1]  
Interest rate 1.37%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= wcn_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= wcn_TermLoanFacilityMember		 [1]  
[1] Interest rates in the table above represent the range of interest rates incurred during the three month period ended March 31, 2015.