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Subsidiary Guarantors - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | $ 3,057 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 2,205 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 2,962 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 2,695 us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash |  | 76 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |  |
Accounts receivable - trade, net | 52,513 us-gaap_AccountsReceivableNetCurrent | 55,750 us-gaap_AccountsReceivableNetCurrent |  |
Refundable income taxes | 526 us-gaap_IncomeTaxesReceivable | 554 us-gaap_IncomeTaxesReceivable |  |
Prepaid expenses | 7,096 us-gaap_PrepaidExpenseCurrent | 8,763 us-gaap_PrepaidExpenseCurrent |  |
Inventory | 4,418 us-gaap_InventoryGross | 4,374 us-gaap_InventoryGross |  |
Deferred income taxes | 2,012 us-gaap_DeferredTaxAssetsNetCurrent | 2,095 us-gaap_DeferredTaxAssetsNetCurrent |  |
Other current assets | 3,407 us-gaap_OtherAssetsCurrent | 4,852 us-gaap_OtherAssetsCurrent |  |
Total current assets | 73,029 us-gaap_AssetsCurrent | 78,669 us-gaap_AssetsCurrent |  |
Property, plant and equipment, net | 404,453 us-gaap_PropertyPlantAndEquipmentNet | 414,542 us-gaap_PropertyPlantAndEquipmentNet |  |
Goodwill | 119,170 us-gaap_Goodwill | 119,170 us-gaap_Goodwill |  |
Intangible assets, net | 11,070 us-gaap_FiniteLivedIntangibleAssetsNet | 11,808 us-gaap_FiniteLivedIntangibleAssetsNet |  |
Restricted assets | 2,554 us-gaap_RestrictedCashAndInvestmentsNoncurrent | 6,632 us-gaap_RestrictedCashAndInvestmentsNoncurrent |  |
Cost method investments | 14,432 us-gaap_CostMethodInvestments | 14,432 us-gaap_CostMethodInvestments |  |
Other non-current assets | 29,696 us-gaap_OtherAssetsNoncurrent | 24,542 us-gaap_OtherAssetsNoncurrent |  |
Total non-current assets | 581,375 us-gaap_AssetsNoncurrent | 591,126 us-gaap_AssetsNoncurrent |  |
Total assets | 654,404 us-gaap_Assets | 669,795 us-gaap_Assets | 660,438 us-gaap_Assets |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases | 1,457 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent | 1,656 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent |  |
Accounts payable | 39,410 us-gaap_AccountsPayableCurrent | 48,518 us-gaap_AccountsPayableCurrent |  |
Accrued payroll and related expenses | 4,136 us-gaap_EmployeeRelatedLiabilitiesCurrent | 6,289 us-gaap_EmployeeRelatedLiabilitiesCurrent |  |
Accrued interest | 4,945 us-gaap_InterestPayableCurrent | 11,094 us-gaap_InterestPayableCurrent |  |
Current accrued capping, closure and post-closure costs | 1,985 us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCosts | 2,208 us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCosts |  |
Other accrued liabilities | 16,200 us-gaap_OtherAccruedLiabilitiesCurrent | 16,667 us-gaap_OtherAccruedLiabilitiesCurrent |  |
Total current liabilities | 68,133 us-gaap_LiabilitiesCurrent | 86,432 us-gaap_LiabilitiesCurrent |  |
Long-term debt and capital leases, less current maturities | 545,442 us-gaap_LongTermDebtAndCapitalLeaseObligations | 534,055 us-gaap_LongTermDebtAndCapitalLeaseObligations |  |
Accrued capping, closure and post-closure costs, less current portion | 38,609 us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCostsNoncurrent | 37,621 us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCostsNoncurrent |  |
Deferred income taxes | 6,948 us-gaap_DeferredTaxLiabilitiesNoncurrent | 7,080 us-gaap_DeferredTaxLiabilitiesNoncurrent |  |
Other long-term liabilities | 16,128 us-gaap_OtherLiabilitiesNoncurrent | 16,627 us-gaap_OtherLiabilitiesNoncurrent |  |
STOCKHOLDERS' (DEFICIT) EQUITY: |  |  |  |
Total Casella Waste Systems, Inc. stockholders' (deficit) equity | (20,902)us-gaap_StockholdersEquity | (12,253)us-gaap_StockholdersEquity |  |
Noncontrolling interests | 46 us-gaap_MinorityInterest | 233 us-gaap_MinorityInterest |  |
Total stockholders' (deficit) equity | (20,856)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | (12,020)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |
Total liabilities and stockholders' (deficit) equity | 654,404 us-gaap_LiabilitiesAndStockholdersEquity | 669,795 us-gaap_LiabilitiesAndStockholdersEquity |  |
Parent [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 2,441 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,596 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,734 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,312 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accounts receivable - trade, net | 392 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 597 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Refundable income taxes | 526 us-gaap_IncomeTaxesReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 554 us-gaap_IncomeTaxesReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Prepaid expenses | 2,139 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,622 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Deferred income taxes | 2,012 us-gaap_DeferredTaxAssetsNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,095 us-gaap_DeferredTaxAssetsNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other current assets | 296 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 296 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current assets | 7,806 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,760 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Property, plant and equipment, net | 5,366 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,049 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Intangible assets, net | 76 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 98 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Restricted assets | 1,733 us-gaap_RestrictedCashAndInvestmentsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,819 us-gaap_RestrictedCashAndInvestmentsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Cost method investments | 14,432 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,432 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investments in subsidiaries | (9,519)cwst_InvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (9,888)cwst_InvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other non-current assets | 19,613 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,611 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total non-current assets | 31,701 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 30,121 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Intercompany receivable | 520,428 cwst_IntercompanyReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 537,228 cwst_IntercompanyReceivable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 559,935 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 576,109 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases | 91 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 89 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accounts payable | 5,632 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17,953 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accrued payroll and related expenses | 681 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,536 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accrued interest | 4,931 us-gaap_InterestPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11,083 us-gaap_InterestPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other accrued liabilities | 9,638 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,618 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current liabilities | 20,973 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 39,279 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Long-term debt and capital leases, less current maturities | 544,291 us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 532,889 us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Deferred income taxes | 6,948 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,080 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other long-term liabilities | 8,625 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9,114 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
STOCKHOLDERS' (DEFICIT) EQUITY: |  |  |  |
Total Casella Waste Systems, Inc. stockholders' (deficit) equity | (20,902)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (12,253)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total stockholders' (deficit) equity | (20,902)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (12,253)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and stockholders' (deficit) equity | 559,935 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 576,109 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Guarantors [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 223 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 253 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 199 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 243 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Restricted cash |  | 76 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accounts receivable - trade, net | 52,047 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 55,053 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Prepaid expenses | 4,955 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,136 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Inventory | 4,418 us-gaap_InventoryGross / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 4,345 us-gaap_InventoryGross / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other current assets | 3,103 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 4,549 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total current assets | 64,746 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 69,412 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Property, plant and equipment, net | 399,087 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 408,843 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Goodwill | 119,170 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 119,170 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Intangible assets, net | 10,994 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 11,710 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Restricted assets | 821 us-gaap_RestrictedCashAndInvestmentsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 813 us-gaap_RestrictedCashAndInvestmentsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Cost method investments | 1,932 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,932 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other non-current assets | 10,083 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 9,931 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total non-current assets | 542,087 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 552,399 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Intercompany receivable | (483,467)cwst_IntercompanyReceivable / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (500,267)cwst_IntercompanyReceivable / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total assets | 123,366 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 121,544 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases | 1,366 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,567 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accounts payable | 33,458 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 30,040 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accrued payroll and related expenses | 3,453 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 4,751 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accrued interest | 14 us-gaap_InterestPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 11 us-gaap_InterestPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Current accrued capping, closure and post-closure costs | 1,982 us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 2,205 us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCosts / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other accrued liabilities | 6,553 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 7,957 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total current liabilities | 46,826 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 46,531 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Long-term debt and capital leases, less current maturities | 1,151 us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 1,166 us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accrued capping, closure and post-closure costs, less current portion | 38,576 us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCostsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 37,589 us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCostsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other long-term liabilities | 7,424 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 7,433 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
STOCKHOLDERS' (DEFICIT) EQUITY: |  |  |  |
Total Casella Waste Systems, Inc. stockholders' (deficit) equity | 29,389 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 28,825 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total stockholders' (deficit) equity | 29,389 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 28,825 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total liabilities and stockholders' (deficit) equity | 123,366 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 121,544 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Non-Guarantors [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 393 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 356 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 29 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 140 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Accounts receivable - trade, net | 74 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 100 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Prepaid expenses | 2 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 5 us-gaap_PrepaidExpenseCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Inventory |  | 29 us-gaap_InventoryGross / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other current assets | 8 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 7 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total current assets | 477 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 497 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Property, plant and equipment, net |  | 650 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total non-current assets |  | 650 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Intercompany receivable | (38,893)cwst_IntercompanyReceivable / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (38,893)cwst_IntercompanyReceivable / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total assets | (38,416)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (37,746)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
CURRENT LIABILITIES: |  |  |  |
Accounts payable | 320 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 525 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Accrued payroll and related expenses | 2 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2 us-gaap_EmployeeRelatedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Current accrued capping, closure and post-closure costs | 3 us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCosts / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 3 us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCosts / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other accrued liabilities | 9 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 92 us-gaap_OtherAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total current liabilities | 334 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 622 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Accrued capping, closure and post-closure costs, less current portion | 33 us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCostsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 32 us-gaap_AccruedCappingClosurePostClosureAndEnvironmentalCostsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other long-term liabilities | 79 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 80 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
STOCKHOLDERS' (DEFICIT) EQUITY: |  |  |  |
Total Casella Waste Systems, Inc. stockholders' (deficit) equity | (38,908)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (38,713)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Noncontrolling interests | 46 us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 233 us-gaap_MinorityInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total stockholders' (deficit) equity | (38,862)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (38,480)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total liabilities and stockholders' (deficit) equity | (38,416)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (37,746)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Elimination [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cost method investments | (1,932)us-gaap_CostMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | (1,932)us-gaap_CostMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Investments in subsidiaries | 9,519 cwst_InvestmentInSubsidiaries / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 9,888 cwst_InvestmentInSubsidiaries / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Total non-current assets | 7,587 us-gaap_AssetsNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 7,956 us-gaap_AssetsNoncurrent / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Intercompany receivable | 1,932 cwst_IntercompanyReceivable / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 1,932 cwst_IntercompanyReceivable / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Total assets | 9,519 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 9,888 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
STOCKHOLDERS' (DEFICIT) EQUITY: |  |  |  |
Total Casella Waste Systems, Inc. stockholders' (deficit) equity | 9,519 us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 9,888 us-gaap_StockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Total stockholders' (deficit) equity | 9,519 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | 9,888 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |
Total liabilities and stockholders' (deficit) equity | $ 9,519 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember | $ 9,888 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ConsolidationItemsAxis = us-gaap_ConsolidationEliminationsMember |  |

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