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Debt and Credit Facilities - Total Debt Outstanding (Parenthetical) (Detail) (USD $)
 12 Months Ended 1 Months Ended 3 Months Ended 0 Months Ended
Dec. 31, 2014
Nov. 30, 2014
Dec. 31, 2014
Oct. 16, 2014
Dec. 31, 2013
Nov. 30, 2012
Mar. 31, 2013
Sep. 30, 2012
Debt Instrument [Line Items]                
Amount utilized under accounts receivable securitization program $ 36,000,000see_AmountOutstandingUnderAccountsReceivableSecuritizationProgram   $ 36,000,000see_AmountOutstandingUnderAccountsReceivableSecuritizationProgram          
Credit facility amount outstanding 23,000,000us-gaap_LineOfCredit   23,000,000us-gaap_LineOfCredit   0us-gaap_LineOfCredit      
Short-term borrowings 130,400,000us-gaap_ShortTermBorrowings   130,400,000us-gaap_ShortTermBorrowings   81,600,000us-gaap_ShortTermBorrowings [1]      
Weighted average interest rate 5.20%us-gaap_DebtWeightedAverageInterestRate   5.20%us-gaap_DebtWeightedAverageInterestRate   6.20%us-gaap_DebtWeightedAverageInterestRate      
Term Loan A Facility Due July 2017 [Member]                
Debt Instrument [Line Items]                
Credit facility amount outstanding 249,700,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanAFacilityDueTwoThousandSeventeenMember		   249,700,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanAFacilityDueTwoThousandSeventeenMember		          
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Consumer 300,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsConsumer
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanAFacilityDueTwoThousandSeventeenMember		   300,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsConsumer
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanAFacilityDueTwoThousandSeventeenMember		          
Term loan facilities, prepayment due year 2016              
Term Loan A Facility Due July 2019 [Member]                
Debt Instrument [Line Items]                
Credit facility amount outstanding 1,129,400,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanAFacilityDueTwoThousandNineteenMember		   1,129,400,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanAFacilityDueTwoThousandNineteenMember		   684,500,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanAFacilityDueTwoThousandNineteenMember		      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Consumer 10,600,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsConsumer
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanAFacilityDueTwoThousandNineteenMember		   10,600,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsConsumer
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanAFacilityDueTwoThousandNineteenMember		   8,400,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsConsumer
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanAFacilityDueTwoThousandNineteenMember		      
Term Loan B Facility Due October 2018 [Member]                
Debt Instrument [Line Items]                
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Consumer         7,300,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsConsumer
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanBFacilityDueOctoberTwoThousandEighteenMember		      
Unamortized discount         10,800,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= see_TermLoanBFacilityDueOctoberTwoThousandEighteenMember		      
8.125% Senior Notes Due September 2019 [Member]                
Debt Instrument [Line Items]                
Debt interest rate 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_EightPointOneHundredTwentyFivePercentSeniorNotesDueTwoThousandNineteenMember		 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_EightPointOneHundredTwentyFivePercentSeniorNotesDueTwoThousandNineteenMember		 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_EightPointOneHundredTwentyFivePercentSeniorNotesDueTwoThousandNineteenMember		   8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_EightPointOneHundredTwentyFivePercentSeniorNotesDueTwoThousandNineteenMember		      
Aggregate principal amount 750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= see_EightPointOneHundredTwentyFivePercentSeniorNotesDueTwoThousandNineteenMember		 750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= see_EightPointOneHundredTwentyFivePercentSeniorNotesDueTwoThousandNineteenMember		 750,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= see_EightPointOneHundredTwentyFivePercentSeniorNotesDueTwoThousandNineteenMember		          
Credit facility, maturity date   Sep. 15, 2019 Sep. 01, 2019          
6.50% Senior Notes Due December 2020 [Member]                
Debt Instrument [Line Items]                
Debt interest rate 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_SeniorNotesSixPointFivePercentageDue2020Member		   6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_SeniorNotesSixPointFivePercentageDue2020Member		 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_SeniorNotesSixPointFivePercentageDue2020Member		 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_SeniorNotesSixPointFivePercentageDue2020Member		 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_SeniorNotesSixPointFivePercentageDue2020Member		    
Aggregate principal amount           425,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= see_SeniorNotesSixPointFivePercentageDue2020Member		    
Credit facility, maturity date       Dec. 01, 2020        
Unwound debt amount       100,000,000see_UnwoundDebtAmount
/ us-gaap_LongtermDebtTypeAxis
= see_SeniorNotesSixPointFivePercentageDue2020Member		        
8.375% Senior Notes Due September 2021 [Member]                
Debt Instrument [Line Items]                
Debt interest rate 8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_EightPointThreeHundredSeventyFivePercentSeniorNotesTwoThousandTwentyOneMember		   8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_EightPointThreeHundredSeventyFivePercentSeniorNotesTwoThousandTwentyOneMember		   8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_EightPointThreeHundredSeventyFivePercentSeniorNotesTwoThousandTwentyOneMember		      
4.875% Senior Notes due December 2022 [Member]                
Debt Instrument [Line Items]                
Debt interest rate 4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_FourPointEightHundredAndSeventyFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyTwoMember		 4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_FourPointEightHundredAndSeventyFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyTwoMember		 4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_FourPointEightHundredAndSeventyFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyTwoMember		   4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_FourPointEightHundredAndSeventyFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyTwoMember		      
Aggregate principal amount 425,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= see_FourPointEightHundredAndSeventyFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyTwoMember		 425,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= see_FourPointEightHundredAndSeventyFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyTwoMember		 425,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= see_FourPointEightHundredAndSeventyFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyTwoMember		          
Credit facility, maturity date   Dec. 01, 2022 Dec. 01, 2022          
5.25% Senior Notes Due April 2023 [Member]                
Debt Instrument [Line Items]                
Debt interest rate 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember		   5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember		   5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember		   5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember		  
Aggregate principal amount             425,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointTwoFivePercentSeniorNotesDueAprilTwoThousandTwentyThreeMember		  
5.125% Senior Notes due December 2024 [Member]                
Debt Instrument [Line Items]                
Debt interest rate 5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointOneTwoFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyFourMember		 5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointOneTwoFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyFourMember		 5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointOneTwoFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyFourMember		   5.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointOneTwoFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyFourMember		      
Aggregate principal amount 425,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointOneTwoFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyFourMember		 425,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointOneTwoFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyFourMember		 425,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= see_FivePointOneTwoFivePercentageSeniorNotesDueDecemberTwoThousandAndTwentyFourMember		          
Credit facility, maturity date   Dec. 01, 2024 Dec. 01, 2024          
6.875% Senior Notes Due July 2033 [Member]                
Debt Instrument [Line Items]                
Unamortized discount 1,300,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember		   1,300,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember		   1,400,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember		      
Debt interest rate 6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember		   6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember		   6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_SixPointEightHundredSeventyFivePercentSeniorNotesDueJulyTwoThousandThirtyThreeMember		      
12% Senior Notes Due February 2014 [Member]                
Debt Instrument [Line Items]                
Debt interest rate 12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_TwelvePercentSeniorNotesDueFebruaryTwoThousandFourteenMember		   12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_TwelvePercentSeniorNotesDueFebruaryTwoThousandFourteenMember		   12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_TwelvePercentSeniorNotesDueFebruaryTwoThousandFourteenMember		     12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= see_TwelvePercentSeniorNotesDueFebruaryTwoThousandFourteenMember
Senior Notes         150,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= see_TwelvePercentSeniorNotesDueFebruaryTwoThousandFourteenMember		      
Line of Credit [Member]                
Debt Instrument [Line Items]                
Short-term borrowings $ 71,000,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LineOfCreditMember		   $ 71,000,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LineOfCreditMember		          
[1] Certain amounts have been revised to reflect the retrospective application of the Company’s change in inventory costing method for certain U.S. inventories to the FIFO method from the LIFO method. Refer to Note 2, “Summary of Significant Accounting Policies - Inventories,” of the notes to consolidated financial statements for further details surrounding this accounting policy change.