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INCOME TAXES (Details 2) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss carryforward $ 3,195,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 6,270,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Accruals, allowances and other 4,432,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 1,708,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Environmental compliance and other site related costs 10,305,000ecol_DeferredTaxAssetsEnvironmentalComplianceAndOtherSiteRelatedCosts 554,000ecol_DeferredTaxAssetsEnvironmentalComplianceAndOtherSiteRelatedCosts
Unrealized foreign exchange gains and losses 1,180,000us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses 636,000us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses
Unrealized gains and losses on interest rate hedge 1,098,000us-gaap_DeferredTaxAssetsHedgingTransactions  
Total deferred tax assets 20,210,000us-gaap_DeferredTaxAssetsGross 9,168,000us-gaap_DeferredTaxAssetsGross
Less: valuation allowance (2,718,000)us-gaap_DeferredTaxAssetsValuationAllowance (6,253,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 17,492,000us-gaap_DeferredTaxAssetsNet 2,915,000us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Property and equipment (110,652,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (6,752,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangible assets (8,305,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (9,425,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Other (1,623,000)us-gaap_DeferredTaxLiabilitiesOther (176,000)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (120,580,000)us-gaap_DeferredIncomeTaxLiabilities (16,353,000)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liability (103,088,000)us-gaap_DeferredTaxLiabilities (13,438,000)us-gaap_DeferredTaxLiabilities
Excess of tax basis over financial reporting basis in investment in foreign subsidiaries 18,800,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries  
Federal net operating loss carry forward 1,300,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic  
Foreign    
Deferred tax liabilities:    
Foreign tax credit carry forwards $ 1,700,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember