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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
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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 | 5,676,699 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember | 6,588,352 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember | 8,132,220 us-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 | 74,437 see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWithheldForTaxesInPeriod / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember | 223,610 see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWithheldForTaxesInPeriod / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember | 524,910 see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWithheldForTaxesInPeriod / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember
Number of shares available, end of year | 8,780,610 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember | 5,676,699 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember | 6,588,352 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember
Weighted average per share market value of awards on grant date | $ 32.70 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember | $ 27.20 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember | $ 17.19 us-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 | 4,250,000 us-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 | 9,800 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember | 3,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember | 12,200 us-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 | 106,220 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember | 40,100 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember | 41,700 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options granted and deferred in period. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options granted and issued in period. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options withheld for taxes in period. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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