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Commitments and Contingencies - Schedule of Environmental Liability Associated with Potsdam (Detail) (Potsdam Environmental Remediation Liability [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
Site Contingency [Line Items]
Beginning balance	$ 5,421us-gaap_AccrualForEnvironmentalLossContingencies		$ 5,142us-gaap_AccrualForEnvironmentalLossContingencies
Obligations settled	(26)us-gaap_AccrualForEnvironmentalLossContingenciesPayments
Ending balance	5,429us-gaap_AccrualForEnvironmentalLossContingencies	5,162us-gaap_AccrualForEnvironmentalLossContingencies	5,142us-gaap_AccrualForEnvironmentalLossContingencies
Accretion Expense [Member]
Site Contingency [Line Items]
Accretion expense	$ 34us-gaap_AccrualForEnvironmentalLossContingenciesProvisionForNewLosses / us-gaap_EnvironmentalRemediationSiteAxis = cwst_PotsdamEnvironmentalLiabilityMember / us-gaap_NatureOfExpenseAxis = cwst_EnvironmentalAccretionExpenseMember	$ 20us-gaap_AccrualForEnvironmentalLossContingenciesProvisionForNewLosses / us-gaap_EnvironmentalRemediationSiteAxis = cwst_PotsdamEnvironmentalLiabilityMember / us-gaap_NatureOfExpenseAxis = cwst_EnvironmentalAccretionExpenseMember

X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 30

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 25

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346

+ Details

Name:	us-gaap_AccrualForEnvironmentalLossContingencies
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The aggregate amount disbursed during the reporting period to settle environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.Y.Q2)

-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

+ Details

Name:	us-gaap_AccrualForEnvironmentalLossContingenciesPayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount added to the accrual for newly incurred environmental loss contingencies. These additions include remediation expense and interest accretion. These additions do not relate to changes in the environmental accrual related to a business acquisition or divestiture, to currency movements, or revisions in previously existing estimates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.Y.Q2)

-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

+ Details

Name:	us-gaap_AccrualForEnvironmentalLossContingenciesProvisionForNewLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_SiteContingencyLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration