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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Line Items]      
Effective Income Tax Rate Reconciliation, Percent 326.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations (19.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (16.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 2,800,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued $ 4,900,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued $ 8,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Income from continuing operations before income taxes and equity income      
United States 20,168,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic (26,855,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic 40,411,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
International (11,846,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (156,477,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (258,906,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income (loss) from continuing operations before income taxes and equity income (loss) 8,322,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (183,332,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (218,495,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Currently payable:      
U.S. federal 4,495,000us-gaap_CurrentFederalTaxExpenseBenefit 10,949,000us-gaap_CurrentFederalTaxExpenseBenefit 22,603,000us-gaap_CurrentFederalTaxExpenseBenefit
U.S. state 557,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,375,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,561,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
International 14,569,000us-gaap_CurrentForeignTaxExpenseBenefit 41,015,000us-gaap_CurrentForeignTaxExpenseBenefit 21,795,000us-gaap_CurrentForeignTaxExpenseBenefit
Total income taxes currently payable 19,621,000us-gaap_CurrentIncomeTaxExpenseBenefit 53,339,000us-gaap_CurrentIncomeTaxExpenseBenefit 45,959,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred U.S. federal 2,503,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit (17,341,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (3,831,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred U.S. state 807,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 401,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (843,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred international 4,240,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit (1,487,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (6,034,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total income tax expense 27,171,000us-gaap_IncomeTaxExpenseBenefit 34,912,000us-gaap_IncomeTaxExpenseBenefit 35,251,000us-gaap_IncomeTaxExpenseBenefit
Cash payments for income taxes, including taxes on gain or loss from discontinued business 36,000,000us-gaap_IncomeTaxesPaid 44,400,000us-gaap_IncomeTaxesPaid 42,600,000us-gaap_IncomeTaxesPaid
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
U.S. federal income tax 2,913,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (64,166,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (76,473,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
U.S. state income taxes, net of federal income tax benefit 658,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (851,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 290,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
U.S. domestic manufacturing deductions and credits (1,882,000)hsc_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivitiesandTaxCredits (4,700,000)hsc_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivitiesandTaxCredits (3,580,000)hsc_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivitiesandTaxCredits
Tax costs of repatriation from the Infrastructure Transaction 0hsc_EffectiveIncomeTaxRateReconciliationChangeinReinvestmentAssertions 13,181,000hsc_EffectiveIncomeTaxRateReconciliationChangeinReinvestmentAssertions 0hsc_EffectiveIncomeTaxRateReconciliationChangeinReinvestmentAssertions
Difference in effective tax rates on international earnings and remittances 4,420,000hsc_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferentialandRepatriationofForeignEarnings (308,000)hsc_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferentialandRepatriationofForeignEarnings 1,532,000hsc_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferentialandRepatriationofForeignEarnings
Uncertain tax position contingencies and settlements (5,298,000)hsc_EffectiveIncomeTaxRateReconciliationTaxContingenciesandSettlements (5,548,000)hsc_EffectiveIncomeTaxRateReconciliationTaxContingenciesandSettlements (5,470,000)hsc_EffectiveIncomeTaxRateReconciliationTaxContingenciesandSettlements
Changes in realization on beginning of the year deferred tax assets 2,203,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 20,125,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 3,980,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Restructuring and impairment charges with no realizable tax benefits 22,049,000us-gaap_IncomeTaxReconciliationNondeductibleExpense 0us-gaap_IncomeTaxReconciliationNondeductibleExpense 21,387,000us-gaap_IncomeTaxReconciliationNondeductibleExpense
U.S. nondeductible items 1,216,000hsc_EffectiveIncomeTaxRateReconciliationNondeductibleExpensesOtherThanRestructuringCharges 2,953,000hsc_EffectiveIncomeTaxRateReconciliationNondeductibleExpensesOtherThanRestructuringCharges 1,470,000hsc_EffectiveIncomeTaxRateReconciliationNondeductibleExpensesOtherThanRestructuringCharges
Loss from disposal from the Infrastructure Transaction 1,465,000us-gaap_IncomeTaxReconciliationDispositionOfBusiness 74,946,000us-gaap_IncomeTaxReconciliationDispositionOfBusiness 0us-gaap_IncomeTaxReconciliationDispositionOfBusiness
Non-deductible goodwill impairment 0us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses 0us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses 92,763,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
Cumulative effect of change in statutory tax rates/laws 246,000us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate (483,000)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate (260,000)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Loss from unconsolidated entities (587,000)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary 0us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary 0us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary
Other, net (232,000)us-gaap_IncomeTaxReconciliationDeductionsOther (237,000)us-gaap_IncomeTaxReconciliationDeductionsOther (388,000)us-gaap_IncomeTaxReconciliationDeductionsOther
Goodwill impairment charge 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 265,038,000us-gaap_GoodwillImpairmentLoss
Components of Deferred Tax Assets and Liabilities [Abstract]      
Expense accruals 27,657,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 28,550,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Inventories 5,009,000us-gaap_DeferredTaxAssetsInventory 3,592,000us-gaap_DeferredTaxAssetsInventory  
Provision for receivables 798,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 752,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts  
Operating loss carryforwards 75,635,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 75,443,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Foreign tax credit carryforwards 16,476,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 16,085,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign  
Capital loss carryforwards 2,102,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 3,177,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards  
Pensions 86,995,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 81,564,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions  
Currency adjustments 35,386,000us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses 27,536,000us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses  
Unit adjustment liability 34,675,000hsc_DeferredTaxAssetsUnitAdjustmentLiability 39,335,000hsc_DeferredTaxAssetsUnitAdjustmentLiability  
Post-retirement benefits 905,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 1,013,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits  
Other 9,079,000us-gaap_DeferredTaxAssetsOther 6,159,000us-gaap_DeferredTaxAssetsOther  
Deferred tax assets, gross 294,717,000us-gaap_DeferredTaxAssetsGross 283,206,000us-gaap_DeferredTaxAssetsGross  
Valuation allowance (131,342,000)us-gaap_DeferredTaxAssetsValuationAllowance (127,164,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Deferred tax assets, net 163,375,000us-gaap_DeferredTaxAssetsNet 156,042,000us-gaap_DeferredTaxAssetsNet  
Depreciation and amortization 16,026,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 24,585,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Deferred revenue 1,708,000us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome 1,764,000us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome  
Equity investment in Infrastructure strategic venture 23,885,000us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates 28,965,000us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates  
Deferred tax liabilities 41,619,000us-gaap_DeferredIncomeTaxLiabilities 55,314,000us-gaap_DeferredIncomeTaxLiabilities  
Deferred Tax Assets, Net, Classification [Abstract]      
Other current assets 39,003,000us-gaap_DeferredTaxAssetsNetCurrent 44,315,000us-gaap_DeferredTaxAssetsNetCurrent  
Other assets 90,252,000us-gaap_DeferredTaxAssetsNetNoncurrent 65,105,000us-gaap_DeferredTaxAssetsNetNoncurrent  
Other current liabilities 1,120,000us-gaap_DeferredTaxLiabilitiesCurrent 475,000us-gaap_DeferredTaxLiabilitiesCurrent  
Deferred income taxes 6,379,000us-gaap_DeferredTaxLiabilitiesNoncurrent 8,217,000us-gaap_DeferredTaxLiabilitiesNoncurrent  
Undistributed earnings indefinitely reinvested outside United States 705,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries 815,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries  
One-time cost associated with repatriation of undistributed earnings indefinitely reinvested outside United States 124,000,000hsc_UndistributedEarningsofForeignSubsidiariesIncomeTaxExpenseIfRepatriated    
Infrastructure transaction      
Income Tax Disclosure [Line Items]      
Gain (Loss) on Disposition of Business (3,900,000)us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hsc_HarscoInfrastructureMember		 (271,300,000)us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hsc_HarscoInfrastructureMember		  
Pension adjustments      
Deferred Tax Assets, Net, Classification [Abstract]      
Non-cash tax expense 8,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= hsc_ValuationAllowanceDeferredTaxAssetPensionAdjustmentsMember		    
Losses in certain jurisdictions that the Company determined it is more likely than not that these assets will not be realized      
Deferred Tax Assets, Net, Classification [Abstract]      
Non-cash tax expense 6,500,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= hsc_ValuationAllowanceDeferredTaxAssetsOperatingLossCarryforwardsMoreLikelyThanNotNotToBeRealizedMember		 7,100,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= hsc_ValuationAllowanceDeferredTaxAssetsOperatingLossCarryforwardsMoreLikelyThanNotNotToBeRealizedMember		  
Currency translation      
Deferred Tax Assets, Net, Classification [Abstract]      
Non-cash tax expense (9,300,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= hsc_ValuationAllowanceDeferredTaxAssetCurrencyTranslationMember		    
Capital loss carryforward      
Deferred Tax Assets, Net, Classification [Abstract]      
Non-cash tax expense (1,100,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= hsc_ValuationAllowanceDeferredTaxAssetCapitalLossCarryforwardMember		    
Infrastructure Transaction      
Deferred Tax Assets, Net, Classification [Abstract]      
Non-cash tax expense   9,400,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= hsc_ValuationAllowanceDeferredTaxAssetsDisposalOfAssetsMember		  
Expiring in 2018      
Components of Deferred Tax Assets and Liabilities [Abstract]      
Capital loss carryforwards 2,100,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
/ us-gaap_TaxPeriodAxis
= hsc_TaxYear2018Member		    
International operations      
Components of Deferred Tax Assets and Liabilities [Abstract]      
Operating loss carryforwards 66,400,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
Deferred Tax Assets, Net, Classification [Abstract]      
Operating loss carryforwards not subject to expiration 44,800,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
Operating losses subject to expiration 21,600,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		    
International operations | United Kingdom | Pensions and currency translation      
Deferred Tax Assets, Net, Classification [Abstract]      
Non-cash tax expense   15,800,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_StatementGeographicalAxis
= country_GB
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= hsc_DeferredTaxAssetsPensionsAndUnrealizedCurrencyLossesMember		  
International operations | Europe, Asia and Middle East      
Deferred Tax Assets, Net, Classification [Abstract]      
Reduction in income tax expense due to tax holidays 0us-gaap_IncomeTaxHolidayAggregateDollarAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_StatementGeographicalAxis
= hsc_EuropeAsiaAndMiddleEastMember		 0us-gaap_IncomeTaxHolidayAggregateDollarAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_StatementGeographicalAxis
= hsc_EuropeAsiaAndMiddleEastMember		  
U.S. state      
Components of Deferred Tax Assets and Liabilities [Abstract]      
Operating loss carryforwards 9,200,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
U.S. state | Expiring between 2013 and 2017      
Components of Deferred Tax Assets and Liabilities [Abstract]      
Operating loss carryforwards 400,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_TaxPeriodAxis
= hsc_TaxYears2013Through2017Member		    
U.S. state | Expiring between 2018 and 2022      
Components of Deferred Tax Assets and Liabilities [Abstract]      
Operating loss carryforwards 3,900,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_TaxPeriodAxis
= hsc_TaxYears2018Through2022Member		    
U.S. state | Expiring between 2023 and 2027      
Components of Deferred Tax Assets and Liabilities [Abstract]      
Operating loss carryforwards 1,500,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_TaxPeriodAxis
= hsc_TaxYears2023Through2027Member		    
U.S. state | Expiring between 2028 and 2032      
Components of Deferred Tax Assets and Liabilities [Abstract]      
Operating loss carryforwards $ 3,400,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_TaxPeriodAxis
= hsc_TaxYears2028Through2032Member