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Other Post-Employment Benefits and Other Employee Benefit Plans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2014 Age | Dec. 31, 2013
Other Post-Employment Benefits and Other Employee Benefit Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Minimum age of employee for entitlement of other post retirement benefit plans | 55 see_MinimumAgeOfEmployeeForEntitlementOfOtherPostretirementBenefitPlans / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |
Minimum number of years of service for entitlement of other post retirement benefit plans | 10 years |
Amortization period of transition obligation | 20 years |
Accumulated post-retirement benefit obligations, weighted-average discount rate | 3.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | 4.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Belgian Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Health care cost trend rate assumed for 2014 | 4.00%see_DefinedBenefitPlanHealthCareCostTrendRateAssumed / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPostretirementBenefitPlansDefinedBenefitMember |
U.S. Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Health care cost trend rate assumed for 2014 | 6.80%see_DefinedBenefitPlanHealthCareCostTrendRateAssumed / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember |
Health care cost trend rate downgraded | 5.00%us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember |
Canada Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Health care cost trend rate assumed for 2014 | 6.50%see_DefinedBenefitPlanHealthCareCostTrendRateAssumed / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = see_CanadaPostretirementBenefitPlansDefinedBenefitMember |
Health care cost trend rate downgraded | 5.00%us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = see_CanadaPostretirementBenefitPlansDefinedBenefitMember |

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- Definition Amortization period of transition obligation. + References No definition available. + Details
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- Definition Defined benefit plan health care cost trend rate assumed for 2013 + References No definition available. + Details
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- Definition Minimum age of employee for entitlement of other postretirement benefit plans. + References No definition available. + Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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