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Segment Reporting (Reconciliation of Primary Measure of Segment Profitability to Income before Income Tax Provision) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment EBITDA $ 711,304wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization [1] $ 651,339wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization [1] $ 507,807wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization [1]
Depreciation (230,944)us-gaap_Depreciation (218,454)us-gaap_Depreciation (169,027)us-gaap_Depreciation
Amortization of intangibles (27,000)us-gaap_AdjustmentForAmortization (25,410)us-gaap_AdjustmentForAmortization (24,557)us-gaap_AdjustmentForAmortization
Loss on prior office leases   (9,902)us-gaap_GainLossOnContractTermination  
Gain from litigation settlement     3,551us-gaap_GainLossRelatedToLitigationSettlement
Impairments and other operating charges (4,091)wcn_ImpairmentsAndOtherOperatingCharges (4,129)wcn_ImpairmentsAndOtherOperatingCharges (1,627)wcn_ImpairmentsAndOtherOperatingCharges
Interest expense (64,674)us-gaap_InterestExpense (73,579)us-gaap_InterestExpense (53,037)us-gaap_InterestExpense
Other income (expense), net 1,067us-gaap_OtherNonoperatingIncomeExpense 1,056us-gaap_OtherNonoperatingIncomeExpense 1,993us-gaap_OtherNonoperatingIncomeExpense
Income before income tax provision 385,662us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 320,921us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 265,103us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Western [Member]      
Segment EBITDA 258,126wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_WesternMember		 [1] 249,548wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_WesternMember		 [1] 229,427wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_WesternMember		 [1]
Central [Member]      
Segment EBITDA 197,121wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_CentralMember		 [1] 182,790wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_CentralMember		 [1] 164,756wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_CentralMember		 [1]
Eastern [Member]      
Segment EBITDA 116,230wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_EasternMember		 [1] 108,173wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_EasternMember		 [1] 101,046wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_EasternMember		 [1]
Exploration and Production [Member]      
Segment EBITDA 147,261wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_ExplorationAndProductionMember		 [1] 111,056wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_ExplorationAndProductionMember		 [1] 23,651wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_ExplorationAndProductionMember		 [1],[2],[3]
Loss on prior office leases   (742)us-gaap_GainLossOnContractTermination
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_ExplorationAndProductionMember		  
Corporate [Member]      
Segment EBITDA (7,434)wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 [1],[2],[3] (228)wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 [1],[2],[3] (11,073)wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 [1],[2],[3]
Loss on prior office leases   (9,160)us-gaap_GainLossOnContractTermination
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		  
Operating Segments [Member]      
Segment EBITDA 718,738wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 651,567wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 518,880wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Operating Segments [Member] | Western [Member]      
Segment EBITDA 258,126wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_WesternMember		 249,548wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_WesternMember		 229,427wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_WesternMember
Operating Segments [Member] | Central [Member]      
Segment EBITDA 197,121wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_CentralMember		 182,790wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_CentralMember		 164,756wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_CentralMember
Operating Segments [Member] | Eastern [Member]      
Segment EBITDA 116,230wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_EasternMember		 108,173wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_EasternMember		 101,046wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_EasternMember
Operating Segments [Member] | Exploration and Production [Member]      
Segment EBITDA $ 147,261wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_ExplorationAndProductionMember		 $ 111,056wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_ExplorationAndProductionMember		 $ 23,651wcn_SegmentReportingInformationEarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= wcn_ExplorationAndProductionMember
[1] For those items included in the determination of segment EBITDA, the accounting policies of the segments are the same as those described in Note 1.
[2] Corporate functions include accounting, legal, tax, treasury, information technology, risk management, human resources, training and other administrative functions.  Amounts reflected are net of allocations to the four operating segments.
[3] Corporate assets include cash, net deferred tax assets, debt issuance costs, equity investments, and corporate facility leasehold improvements and equipment.