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Restricted Cash / Restricted Assets - Summary of Restricted Cash / Restricted Asset (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Apr. 30, 2014 | Apr. 30, 2013
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Current: |  |  |
Restricted cash / restricted assets | $ 76 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | $ 76 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | $ 76 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Non Current: |  |  |
Restricted cash / restricted assets | 6,632 us-gaap_RestrictedCashAndInvestmentsNoncurrent | 681 us-gaap_RestrictedCashAndInvestmentsNoncurrent | 545 us-gaap_RestrictedCashAndInvestmentsNoncurrent
Landfills [Member] |  |  |
Current: |  |  |
Restricted cash / restricted assets | 76 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandfillMember | 76 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandfillMember | 76 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandfillMember
Non Current: |  |  |
Restricted cash / restricted assets | 813 us-gaap_RestrictedCashAndInvestmentsNoncurrent / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandfillMember | 681 us-gaap_RestrictedCashAndInvestmentsNoncurrent / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandfillMember | 545 us-gaap_RestrictedCashAndInvestmentsNoncurrent / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandfillMember
Capital Projects [Member] |  |  |
Non Current: |  |  |
Restricted cash / restricted assets | $ 5,819 us-gaap_RestrictedCashAndInvestmentsNoncurrent / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cwst_CapitalProjectsMember |  |

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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: 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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandfillMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |