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