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Subsidiary Guarantors - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | $ (5,695)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | $ 1,361 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired |  | 214 us-gaap_ProceedsFromPreviousAcquisition
Additions to property, plant and equipment | (4,444)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (7,477)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Payments on landfill operating lease contracts | (478)cwst_PaymentsForLandfillOperatingLease | (563)cwst_PaymentsForLandfillOperatingLease
Payments related to investments |  | (84)us-gaap_PaymentsToAcquireInvestments
Proceeds from sale of property and equipment | 89 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 216 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash provided by (used in) investing activities | (283)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (7,773)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Proceeds from divestiture transactions | 4,550 us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets |
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings | 197,591 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 47,860 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Principal payments on long-term debt | (186,500)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities | (41,250)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities
Payments of financing costs | (6,852)us-gaap_PaymentsOfFinancingCosts | (17)us-gaap_PaymentsOfFinancingCosts
Net cash provided by (used in) financing activities | 6,830 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 6,593 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Change in restricted cash | 4,086 us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities |
Distributions to noncontrolling interest holder | (1,495)us-gaap_PaymentsToMinorityShareholders |
Net cash provided by (used in) discontinued operations |  | 86 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
Net increase (decrease) in cash and cash equivalents | 852 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 267 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period | 2,205 us-gaap_CashAndCashEquivalentsAtCarryingValue | 2,695 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period | 3,057 us-gaap_CashAndCashEquivalentsAtCarryingValue | 2,962 us-gaap_CashAndCashEquivalentsAtCarryingValue
Acquisition [Member] |  |
Cash Flows from Investing Activities: |  |
Additions to property, plant and equipment | (4,444)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cwst_AcquisitionsMember | (79)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cwst_AcquisitionsMember
Parent [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | (10,886)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5,327)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Flows from Investing Activities: |  |
Additions to property, plant and equipment |  | (256)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by (used in) investing activities | (516)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (256)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings | 197,573 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 47,860 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Principal payments on long-term debt | (186,267)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (41,120)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Payments of financing costs | (6,852)us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (17)us-gaap_PaymentsOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Intercompany borrowings | 3,707 cwst_IntercompanyBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (718)cwst_IntercompanyBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by (used in) financing activities | 12,247 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,005 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Change in restricted cash | 4,086 us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net increase (decrease) in cash and cash equivalents | 845 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 422 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents, beginning of period | 1,596 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,312 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents, end of period | 2,441 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,734 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Parent [Member] | Acquisition [Member] |  |
Cash Flows from Investing Activities: |  |
Additions to property, plant and equipment | (516)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cwst_AcquisitionsMember |
Guarantors [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | 5,604 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 6,799 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Cash Flows from Investing Activities: |  |
Acquisitions, net of cash acquired |  | 214 us-gaap_ProceedsFromPreviousAcquisition / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Additions to property, plant and equipment |  | (7,221)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Payments on landfill operating lease contracts | (478)cwst_PaymentsForLandfillOperatingLease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (563)cwst_PaymentsForLandfillOperatingLease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Payments related to investments | 1,555 us-gaap_PaymentsToAcquireInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (84)us-gaap_PaymentsToAcquireInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Proceeds from sale of property and equipment | 89 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 216 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net cash provided by (used in) investing activities | (1,712)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (7,517)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Proceeds from divestiture transactions | 1,050 us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Cash Flows from Financing Activities: |  |
Proceeds from long-term borrowings | 18 us-gaap_ProceedsFromIssuanceOfLongTermDebt / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |
Principal payments on long-term debt | (233)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (130)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Intercompany borrowings | (3,707)cwst_IntercompanyBorrowings / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 718 cwst_IntercompanyBorrowings / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net cash provided by (used in) financing activities | (3,922)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 588 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net cash provided by (used in) discontinued operations |  | 86 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net increase (decrease) in cash and cash equivalents | (30)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (44)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents, beginning of period | 253 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 243 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Cash and cash equivalents, end of period | 223 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 199 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Guarantors [Member] | Acquisition [Member] |  |
Cash Flows from Investing Activities: |  |
Additions to property, plant and equipment | (3,928)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cwst_AcquisitionsMember | (79)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cwst_AcquisitionsMember
Non-Guarantors [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by (used in) operating activities | (413)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (111)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cash Flows from Investing Activities: |  |
Payments related to investments | (1,555)us-gaap_PaymentsToAcquireInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Net cash provided by (used in) investing activities | 1,945 us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Proceeds from divestiture transactions | 3,500 us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Cash Flows from Financing Activities: |  |
Net cash provided by (used in) financing activities | (1,495)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Distributions to noncontrolling interest holder | (1,495)us-gaap_PaymentsToMinorityShareholders / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |
Net increase (decrease) in cash and cash equivalents | 37 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (111)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents, beginning of period | 356 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 140 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cash and cash equivalents, end of period | $ 393 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | $ 29 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember

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- Definition The cash outflow associated with landfill operating agreements consisting of up-front or one-time payments, future minimum rental payments, including success/expansion fees, other direct costs and capping, closure and post closure costs. + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Increase (decrease) in cash associated with the entity's discontinued operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The net cash inflow or outflow from cash and cash items that are not available for withdrawal or usage. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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