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Income Taxes (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Contingency [Line Items]        
Interest and penalties recognized $ 2,100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense $ 3,100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense $ 1,800,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Interest and penalties accrued 2,800,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 4,900,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 8,000,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Balance at the beginning of the period 17,549,000us-gaap_UnrecognizedTaxBenefits 24,918,000us-gaap_UnrecognizedTaxBenefits 33,408,000us-gaap_UnrecognizedTaxBenefits  
Additions for tax positions related to the current year (includes currency translation adjustment) 288,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 500,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 584,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions  
Additions for tax positions related to prior years (includes currency translation adjustment) 156,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 145,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 37,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions  
Other reductions for tax positions related to prior years 3,056,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 3,050,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 3,987,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions  
Statutes of limitations expirations 2,481,000us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 3,348,000us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 5,124,000us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations  
Settlements 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities 1,616,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities    
Balance at the end of the period 12,456,000us-gaap_UnrecognizedTaxBenefits 17,549,000us-gaap_UnrecognizedTaxBenefits 24,918,000us-gaap_UnrecognizedTaxBenefits  
Reconciliation of Deferred Income Tax Benefits [Roll Forward]        
Balance at beginning of period (198,000)hsc_DeferredTaxBenefits (369,000)hsc_DeferredTaxBenefits (517,000)hsc_DeferredTaxBenefits  
Additions for tax positions related to the current year (includes currency translation adjustment) (2,000)hsc_DeferredTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions (5,000)hsc_DeferredTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions (8,000)hsc_DeferredTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions  
Additions for tax positions related to prior years (includes currency translation adjustment) (55,000)hsc_DeferredTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions (4,000)hsc_DeferredTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 2,000hsc_DeferredTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions  
Other reductions for tax positions related to prior years 0hsc_DeferredTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 0hsc_DeferredTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 0hsc_DeferredTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions  
Statutes of limitation expirations 143,000hsc_DeferredTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 180,000hsc_DeferredTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations 154,000hsc_DeferredTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations  
Settlements 0hsc_DeferredTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities 0hsc_DeferredTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities    
Balance at the end of the period (112,000)hsc_DeferredTaxBenefits (198,000)hsc_DeferredTaxBenefits (369,000)hsc_DeferredTaxBenefits  
Reconciliation of Net Unrecognized Tax Benefits [Roll Forward]        
Balance at the beginning of the period 12,344,000hsc_UnrecognizedTaxBenefitsNet 17,351,000hsc_UnrecognizedTaxBenefitsNet 24,549,000hsc_UnrecognizedTaxBenefitsNet 32,891,000hsc_UnrecognizedTaxBenefitsNet
Additions for tax positions related to the current year (includes currency translation adjustment) 286,000hsc_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositionsNet 495,000hsc_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositionsNet 576,000hsc_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositionsNet  
Additions for tax positions related to prior years (includes currency translation adjustment) 101,000hsc_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositionsNet 141,000hsc_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositionsNet 39,000hsc_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositionsNet  
Other reductions for tax positions related to prior years (3,056,000)hsc_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositionsNet (3,050,000)hsc_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositionsNet (3,987,000)hsc_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositionsNet  
Statutes of limitation expirations (2,338,000)hsc_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitationsNet (3,168,000)hsc_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitationsNet (4,970,000)hsc_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitationsNet  
Settlements 0hsc_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthoritiesNet (1,616,000)hsc_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthoritiesNet    
Balance at the end of the period 12,344,000hsc_UnrecognizedTaxBenefitsNet 17,351,000hsc_UnrecognizedTaxBenefitsNet 24,549,000hsc_UnrecognizedTaxBenefitsNet 32,891,000hsc_UnrecognizedTaxBenefitsNet
Decrease in unrecognized tax benefits due to currency translation 1,600,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation      
Portion of UTB, expected to be recognized upon settlement of tax examinations and the expiration of various statutes of limitations within next twelve months 200,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit      
Foreign jurisdiction        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Settlements 1,500,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		      
Reconciliation of Net Unrecognized Tax Benefits [Roll Forward]        
Decrease related to previously unrecognized tax benefits that were recognized in 2012 due to change in enacted legislation $ 3,100,000hsc_UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromChangesInEnactedLegislation
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember