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Earnings Per Share Level 4 (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]                      
Income from discontinued operations per share, diluted                 $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Income from continuing operations attributable to common stockholders, basic                 $ 170,283,000us-gaap_IncomeLossFromContinuingOperations $ 146,926,000us-gaap_IncomeLossFromContinuingOperations $ 153,583,000us-gaap_IncomeLossFromContinuingOperations
Net Income (Loss) Attributable to Parent [Abstract]                      
Net income attributable to common stockholders 87,794,000us-gaap_NetIncomeLoss 17,651,000us-gaap_NetIncomeLoss 25,922,000us-gaap_NetIncomeLoss 41,102,000us-gaap_NetIncomeLoss 29,318,000us-gaap_NetIncomeLoss [1] 26,779,000us-gaap_NetIncomeLoss [1] 33,615,000us-gaap_NetIncomeLoss [1] 57,620,000us-gaap_NetIncomeLoss [1] 172,469,000us-gaap_NetIncomeLoss 147,332,000us-gaap_NetIncomeLoss 153,845,000us-gaap_NetIncomeLoss
After tax interest on convertible debt                 51,000us-gaap_InterestOnConvertibleDebtNetOfTax 51,000us-gaap_InterestOnConvertibleDebtNetOfTax 51,000us-gaap_InterestOnConvertibleDebtNetOfTax
Income from discontinued operations, net                 2,186,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 406,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 262,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income — diluted                 172,520,000us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 147,383,000us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 153,896,000us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average shares (denominator):                      
Weighted average shares — basic                 (210,741,000)us-gaap_WeightedAverageNumberOfSharesOutstandingBasic (211,811,000)us-gaap_WeightedAverageNumberOfSharesOutstandingBasic (215,712,000)us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Stock options                 3,338,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 4,082,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 3,233,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Convertible debt                 121,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 121,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 121,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Weighted average shares — diluted                 214,200,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 216,014,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 219,066,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income attributable to common stockholders, basic $ 0.42us-gaap_EarningsPerShareBasic [2] $ 0.08us-gaap_EarningsPerShareBasic [2] $ 0.12us-gaap_EarningsPerShareBasic [2] $ 0.19us-gaap_EarningsPerShareBasic [2] $ 0.14us-gaap_EarningsPerShareBasic [2] $ 0.13us-gaap_EarningsPerShareBasic [2] $ 0.16us-gaap_EarningsPerShareBasic [2] $ 0.27us-gaap_EarningsPerShareBasic [2] $ 0.82us-gaap_EarningsPerShareBasic   $ 0.71us-gaap_EarningsPerShareBasic
Net income attributable to common stockholders, diluted $ 0.42us-gaap_EarningsPerShareDiluted [2] $ 0.08us-gaap_EarningsPerShareDiluted [2] $ 0.12us-gaap_EarningsPerShareDiluted [2] $ 0.19us-gaap_EarningsPerShareDiluted [2] $ 0.14us-gaap_EarningsPerShareDiluted [2] $ 0.12us-gaap_EarningsPerShareDiluted [2] $ 0.16us-gaap_EarningsPerShareDiluted [2] $ 0.27us-gaap_EarningsPerShareDiluted [2] $ 0.81us-gaap_EarningsPerShareDiluted   $ 0.70us-gaap_EarningsPerShareDiluted
Income from continuing operations attributable to common stockholders, per share, basic                 $ 0.81sci_Incomefromcontinuingoperationsattributabletocommonstockholderspersharebasic $ 0.70sci_Incomefromcontinuingoperationsattributabletocommonstockholderspersharebasic $ 0.71sci_Incomefromcontinuingoperationsattributabletocommonstockholderspersharebasic
Income from continuing operations attributable to common stockholders, per share, diluted                 $ 0.80sci_Incomefromcontinuingoperationsattributabletocommonstockholderspersharediluted $ 0.68sci_Incomefromcontinuingoperationsattributabletocommonstockholderspersharediluted $ 0.70sci_Incomefromcontinuingoperationsattributabletocommonstockholderspersharediluted
Income from discontinued operations per share, basic                 $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount                 1,500,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,200,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,300,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Scenario, Unspecified [Domain]                      
Weighted average shares (denominator):                      
Net income attributable to common stockholders, basic                   $ 0.70us-gaap_EarningsPerShareBasic
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= us-gaap_ScenarioUnspecifiedDomain		  
Net income attributable to common stockholders, diluted                   $ 0.68us-gaap_EarningsPerShareDiluted
/ us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis
= us-gaap_ScenarioUnspecifiedDomain		  
[1] See Note 2 for details related to the revision which was recorded for the quarter ended December 31, 2013. The revision reduced the provision for income taxes and increased net income attributable to common stockholders by $3.5 million and increased basic and diluted EPS by $0.02.
[2] Net income per share is computed independently for each of the quarters presented. Therefore, the sum of the quarters’ net income per share may not equal the total computed for the year.