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Retirement Plans Retirement Plans Level 4 (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation $ 0us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation $ 21,407,000us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Support, Methodology and Source Data 0.5    
Defined Benefit Plan, Interest Cost 1,293,000us-gaap_DefinedBenefitPlanInterestCost 780,000us-gaap_DefinedBenefitPlanInterestCost 1,109,000us-gaap_DefinedBenefitPlanInterestCost
Defined Benefit Plan, Amortization of Gains (Losses) 2,401,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses (1,205,000)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 1,418,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Defined Benefit Plan, Net Periodic Benefit Cost 3,694,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost (425,000)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost 2,527,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Defined Benefit Plan, Benefit Obligation 37,499,000us-gaap_DefinedBenefitPlanBenefitObligation 28,674,000us-gaap_DefinedBenefitPlanBenefitObligation  
Defined Benefit Plan, Interest Cost 1,293,000us-gaap_DefinedBenefitPlanInterestCost 780,000us-gaap_DefinedBenefitPlanInterestCost 1,109,000us-gaap_DefinedBenefitPlanInterestCost
Defined Benefit Plan, Actuarial Net (Gains) Losses 2,401,000us-gaap_DefinedBenefitPlanActuarialGainLoss (856,000)us-gaap_DefinedBenefitPlanActuarialGainLoss  
Defined Benefit Plan, Benefits Paid (4,273,000)us-gaap_DefinedBenefitPlanBenefitsPaid (12,506,000)us-gaap_DefinedBenefitPlanBenefitsPaid  
Defined Benefit Plan, Benefit Obligation 36,920,000us-gaap_DefinedBenefitPlanBenefitObligation 37,499,000us-gaap_DefinedBenefitPlanBenefitObligation 28,674,000us-gaap_DefinedBenefitPlanBenefitObligation
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Defined Benefit Plan, Fair Value of Plan Assets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets  
Defined Benefit Plan, Contributions by Employer 4,273,000us-gaap_DefinedBenefitPlanContributionsByEmployer 12,506,000us-gaap_DefinedBenefitPlanContributionsByEmployer  
Defined Benefit Plan, Benefits Paid (4,273,000)us-gaap_DefinedBenefitPlanBenefitsPaid (12,506,000)us-gaap_DefinedBenefitPlanBenefitsPaid  
Defined Benefit Plan, Fair Value of Plan Assets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Defined Benefit Plan, Funded Status of Plan (36,920,000)us-gaap_DefinedBenefitPlanFundedStatusOfPlan (37,499,000)us-gaap_DefinedBenefitPlanFundedStatusOfPlan  
Defined Benefit Plan, Amounts Recognized in Balance Sheet (36,920,000)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet (37,499,000)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet  
Defined Benefit Plan, Accumulated Benefit Obligation 36,920,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation 37,499,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation  
Defined Benefit Pension Plan, Liabilities (36,920,000)us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities (37,499,000)us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities  
Defined Benefit Pension Plan, Liabilities, Noncurrent 35,614,000us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent 35,629,000us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent  
Defined Benefit Plan, Estimated Amount of Plan Participants' Future Benefits Covered by Insurance Contracts Issued by Employer or Related Parties 47,800,000us-gaap_DefinedBenefitPlanEstimatedAmountOfPlanParticipantsFutureBenefitsCoveredByInsuranceContractsIssuedByEmployerOrRelatedParties 47,400,000us-gaap_DefinedBenefitPlanEstimatedAmountOfPlanParticipantsFutureBenefitsCoveredByInsuranceContractsIssuedByEmployerOrRelatedParties  
Cash Surrender Value of Life Insurance, Retirement Plans 37,000,000sci_CashSurrenderValueOfLifeInsuranceRetirementPlans 35,800,000sci_CashSurrenderValueOfLifeInsuranceRetirementPlans  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.42%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate 3.66%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate 2.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 3.69%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate 2.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate 4.05%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
2012 3,940,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths    
2013 3,768,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo    
2014 3,471,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree    
2015 3,264,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour    
2016 3,195,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive    
Years 2017 through 2021 11,771,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter    
Defined Contribution Plan, Cost Recognized $ 26,800,000us-gaap_DefinedContributionPlanCostRecognized $ 24,300,000us-gaap_DefinedContributionPlanCostRecognized $ 23,100,000us-gaap_DefinedContributionPlanCostRecognized