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Stockholders' Equity - Non-vested Awards under Omnibus Plan and Predecessor Plans (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Restricted stock shares awarded | (136,197)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod | (98,550)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod | (100,200)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Omnibus Incentive Plan and Predecessor Plans [Member] | Non-vested Restricted Stock Shares Awards [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of non-vested awards, beginning of year | 1,397,350 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockSharesAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Restricted stock shares issued for SLO awards | 572,089 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockSharesAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Restricted stock shares awarded | (301,250)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockSharesAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Restricted stock shares forfeited | (106,220)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockSharesAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Number of non-vested awards, end of year | 1,561,969 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockSharesAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, beginning of year | 21.73 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockSharesAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Restricted stock for new awards, Weighted- Average per Share Market Value on Grant Date during the year | 32.64 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockSharesAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Restricted stock vested, Weighted- Average per Share Market Value on Grant Date during the year | 27.54 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockSharesAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Restricted stock forfeited, Weighted- Average per Share Market Value on Grant Date during the year | 22.45 see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionForfeitedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockSharesAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, Ending of year | 25.09 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockSharesAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Omnibus Incentive Plan and Predecessor Plans [Member] | Non-vested Restricted Stock Units Awards [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of non-vested awards, beginning of year | 506,345 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockUnitsAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Restricted stock shares issued for SLO awards | 431,987 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockUnitsAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Restricted stock shares awarded | (137,197)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockUnitsAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Restricted stock shares forfeited | (9,800)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockUnitsAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Number of non-vested awards, end of year | 791,335 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockUnitsAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, beginning of year | 22.92 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockUnitsAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Restricted stock for new awards, Weighted- Average per Share Market Value on Grant Date during the year | 32.20 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockUnitsAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Restricted stock vested, Weighted- Average per Share Market Value on Grant Date during the year | 33.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockUnitsAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Restricted stock forfeited, Weighted- Average per Share Market Value on Grant Date during the year | 23.89 see_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionForfeitedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockUnitsAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, Ending of year | 27.66 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = see_NonvestedRestrictedStockUnitsAwardsMember / us-gaap_PlanNameAxis = see_OmnibusPlanAndPredecessorPlansMember |  |
2005 Contingent Stock Plan [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Restricted stock shares issued for SLO 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
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, beginning of year | 27.20 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember | 17.19 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember |
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, Ending of year | 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
2005 Contingent Stock Plan [Member] | Cash Awards [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of non-vested awards, beginning of year | 170,848 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = see_CashAwardsMember / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember |  |
Restricted stock shares issued for SLO awards | 127,276 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = see_CashAwardsMember / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember |  |
Restricted stock shares awarded | (25,850)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = see_CashAwardsMember / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember |  |
Restricted stock shares forfeited | (14,500)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = see_CashAwardsMember / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember |  |
Number of non-vested awards, end of year | 257,774 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = see_CashAwardsMember / us-gaap_PlanNameAxis = see_TwoThousandFiveContingentStockPlanMember |  |

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- Definition Share Based Payment Award Equity Instruments Other Than Option Forfeited Weighted Average Grant Date Fair Value. + 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 at grant date for nonvested equity-based awards issued 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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 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 number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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