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Segment Reporting - Summary of Financial Information by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Inter-company revenues | $ 116,577 us-gaap_Revenues | $ 113,197 us-gaap_Revenues |
Depreciation and amortization | 13,748 us-gaap_DepreciationDepletionAndAmortization | 13,608 us-gaap_DepreciationDepletionAndAmortization |
Operating income (loss) | 3,126 us-gaap_OperatingIncomeLoss | (3,674)us-gaap_OperatingIncomeLoss |
Total assets | 654,404 us-gaap_Assets | 660,438 us-gaap_Assets | 669,795 us-gaap_Assets
Eastern Region [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Inter-company revenues | 33,267 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_EasternRegionMember | 31,338 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_EasternRegionMember |
Depreciation and amortization | 5,237 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cwst_EasternRegionMember | 5,329 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cwst_EasternRegionMember |
Operating income (loss) | (485)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cwst_EasternRegionMember | (4,860)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cwst_EasternRegionMember |
Total assets | 205,062 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cwst_EasternRegionMember | 200,137 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cwst_EasternRegionMember |
Western Region [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Inter-company revenues | 49,357 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_WesternRegionMember | 48,739 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_WesternRegionMember |
Depreciation and amortization | 6,738 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cwst_WesternRegionMember | 6,524 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cwst_WesternRegionMember |
Operating income (loss) | 4,995 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cwst_WesternRegionMember | 2,603 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cwst_WesternRegionMember |
Total assets | 325,799 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cwst_WesternRegionMember | 340,862 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cwst_WesternRegionMember |
Recycling [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Inter-company revenues | 10,294 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember | 10,361 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember |
Depreciation and amortization | 1,116 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember | 1,066 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember |
Operating income (loss) | (2,010)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember | (1,484)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember |
Total assets | 50,157 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember | 49,519 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember |
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Inter-company revenues | 23,659 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 22,759 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Depreciation and amortization | 657 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 689 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Operating income (loss) | 626 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 67 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Total assets | 73,386 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 69,920 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Intersubsegment Eliminations [Member] | Inter-Company Revenue [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Inter-company revenues | (22,639)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_SubsegmentsConsolidationItemsAxis = us-gaap_IntersubsegmentEliminationsMember | (24,413)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_SubsegmentsConsolidationItemsAxis = us-gaap_IntersubsegmentEliminationsMember |
Intersubsegment Eliminations [Member] | Eastern Region [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Inter-company revenues | 8,016 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_EasternRegionMember / us-gaap_SubsegmentsConsolidationItemsAxis = us-gaap_IntersubsegmentEliminationsMember | 8,588 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_EasternRegionMember / us-gaap_SubsegmentsConsolidationItemsAxis = us-gaap_IntersubsegmentEliminationsMember |
Intersubsegment Eliminations [Member] | Western Region [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Inter-company revenues | 14,398 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_WesternRegionMember / us-gaap_SubsegmentsConsolidationItemsAxis = us-gaap_IntersubsegmentEliminationsMember | 15,384 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_WesternRegionMember / us-gaap_SubsegmentsConsolidationItemsAxis = us-gaap_IntersubsegmentEliminationsMember |
Intersubsegment Eliminations [Member] | Recycling [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Inter-company revenues | 4 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember / us-gaap_SubsegmentsConsolidationItemsAxis = us-gaap_IntersubsegmentEliminationsMember | (63)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = cwst_RecyclingMember / us-gaap_SubsegmentsConsolidationItemsAxis = us-gaap_IntersubsegmentEliminationsMember |
Intersubsegment Eliminations [Member] | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Inter-company revenues | $ 221 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember / us-gaap_SubsegmentsConsolidationItemsAxis = us-gaap_IntersubsegmentEliminationsMember | $ 504 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember / us-gaap_SubsegmentsConsolidationItemsAxis = us-gaap_IntersubsegmentEliminationsMember |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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