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Business Combinations - Schedule of Purchase Price Paid for Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified | 8 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Business Acquisition [Line Items] |  |  |  |
Cash used in acquisitions, net of cash acquired | $ 360 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 8,305 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 25,225 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 2,102 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Excess purchase price to be allocated to goodwill | 119,170 us-gaap_Goodwill | 119,139 us-gaap_Goodwill | 115,928 us-gaap_Goodwill | 101,706 us-gaap_Goodwill
BBI Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash used in acquisitions, net of cash acquired | 314 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | 7,860 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | 25,225 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember |
Common stock issued |  |  | 2,650 us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember |
Other non-cash considerations |  | 555 us-gaap_BusinessCombinationConsiderationTransferredOther1 / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember |  |
Contingent consideration and holdbacks | 67 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | 1,653 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | 33 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember |
Total | 381 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | 10,068 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | 27,908 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember |
Current assets |  | 814 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | 1,422 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember |
Equipment | 99 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | 2,010 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | 9,423 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember |
Other liabilities, net |  | (241)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | (7,009)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember |
Intangible assets | 251 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | 4,302 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | 9,850 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember |
Fair value of assets acquired and liabilities assumed | 350 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | 6,885 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | 13,686 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember |
Excess purchase price to be allocated to goodwill | $ 31 us-gaap_Goodwill / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | $ 3,183 us-gaap_Goodwill / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember | $ 14,222 us-gaap_Goodwill / us-gaap_InvestmentTypeAxis = cwst_BbiWasteServicesMember |

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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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