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Stockholders' Equity - Summary of Changes in Common Shares Available for Awards under Omnibus Incentive Plan and Predecessor Plans (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
2005 Contingent Stock Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of shares available, beginning of year 5,676,699us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
6,588,352us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
8,132,220us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
Restricted stock shares issued for new awards (572,089)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
(398,230)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
(703,620)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
Shares withheld for taxes 74,437see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWithheldForTaxesInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
223,610see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWithheldForTaxesInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
524,910see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWithheldForTaxesInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
Number of shares available, end of year 8,780,610us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
5,676,699us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
6,588,352us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
Weighted average per share market value of awards on grant date $ 32.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
$ 27.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
$ 17.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
Omnibus Incentive Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock shares issued for new awards 4,250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= see_OmnibusIncentivePlanMember
   
2009 Two-year PSU Awards [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock shares issued for new awards (145,597)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandNineTwoYearPsuAwardsMember
   
2009 Three-year PSU Awards [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock shares issued for new awards   (472,865)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandNineThreeYearPsuAwardsMember
 
2010 Three-year PSU Awards [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock shares issued for new awards     (1,155,018)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandTenThreeYearPsuAwardsMember
2002 Directors Stock Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Director shares granted and issued (21,128)see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndIssuedInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandTwoDirectorsStockPlanMember
(25,993)see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndIssuedInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandTwoDirectorsStockPlanMember
(37,824)see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndIssuedInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandTwoDirectorsStockPlanMember
Director shares granted and deferred (20,444)see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndDeferredInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandTwoDirectorsStockPlanMember
(21,642)see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndDeferredInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandTwoDirectorsStockPlanMember
(23,933)see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedAndDeferredInPeriod
/ us-gaap_PlanNameAxis
= see_TwoThousandTwoDirectorsStockPlanMember
Restricted Stock Units (RSUs) [Member] | 2005 Contingent Stock Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock shares issued for new awards (431,987)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
(187,595)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
(191,700)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
Restricted stock shares forfeited 9,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
3,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
12,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
Restricted Stock SLO Awards [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock shares issued for new awards (101,062)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= see_RestrictedStockSloAwardsMember
(51,321)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= see_RestrictedStockSloAwardsMember
(135,343)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= see_RestrictedStockSloAwardsMember
Restricted Stock SLO Awards [Member] | 2005 Contingent Stock Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock shares issued for new awards (96,773)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= see_RestrictedStockSloAwardsMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
(21,505)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= see_RestrictedStockSloAwardsMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
(3,788)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= see_RestrictedStockSloAwardsMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
Restricted Stock Units RSU SLO Awards [Member] | 2005 Contingent Stock Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock shares issued for new awards (48,528)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= see_RestrictedStockUnitsRsuSloAwardsMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
(51,033)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= see_RestrictedStockUnitsRsuSloAwardsMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
(6,795)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= see_RestrictedStockUnitsRsuSloAwardsMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
Restricted Stock [Member] | 2005 Contingent Stock Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock shares forfeited 106,220us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
40,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember
41,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= see_TwoThousandFiveContingentStockPlanMember