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Stockholders' Equity - Summary of Changes in Common Stock (Detail) | 0 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | ---
Jun. 13, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 28, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares, beginning of year |  | 205,707,580 us-gaap_CommonStockSharesIssued | 204,660,621 us-gaap_CommonStockSharesIssued | 202,528,616 us-gaap_CommonStockSharesIssued |
Shares issued for Grace Settlement |  | 18,000,000 see_SharesIssuedForSettlement |  |  |
Restricted stock shares issued for new awards under the Omnibus Incentive Plan and 2005 Contingent Stock Plan |  | 572,089 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation | 398,230 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation | 703,620 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation |
Shares issued for vested restricted stock units |  | 136,197 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod | 98,550 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod | 100,200 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod |
Number of shares issued, end of year |  | 224,683,653 us-gaap_CommonStockSharesIssued | 205,707,580 us-gaap_CommonStockSharesIssued | 204,660,621 us-gaap_CommonStockSharesIssued |
Number of shares held, beginning of year |  | 9,508,908 us-gaap_TreasuryStockShares | 10,102,952 us-gaap_TreasuryStockShares | 10,466,431 us-gaap_TreasuryStockShares |
Number of common stock shares repurchased | 3,932,244 us-gaap_TreasuryStockSharesAcquired | 1,495,188 us-gaap_TreasuryStockSharesAcquired |  |  |
Number of shares held, end of year |  | 14,151,759 us-gaap_TreasuryStockShares | 9,508,908 us-gaap_TreasuryStockShares | 10,102,952 us-gaap_TreasuryStockShares |
Common Stock in Treasury [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of common stock shares repurchased |  | 5,427,432 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |
Profit sharing contribution partially paid in stock |  | (965,238)see_ProfitSharingContributionPartiallyPaidInStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (857,754)see_ProfitSharingContributionPartiallyPaidInStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (930,089)see_ProfitSharingContributionPartiallyPaidInStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Restricted stock, withheld or forfeited |  | 180,657 see_RestrictedStockRepurchasedWithheldOrForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 263,710 see_RestrictedStockRepurchasedWithheldOrForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 566,610 see_RestrictedStockRepurchasedWithheldOrForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
2002 Directors Stock Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares granted and issued under the Directors Stock Plan |  | 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 |
2011 Three-year PSU Awards [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Restricted stock shares issued for new awards under the Omnibus Incentive Plan and 2005 Contingent Stock Plan |  | 145,597 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = see_TwoThousandElevenThreeYearPsuAwardsMember |  |  | 145,597 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = see_TwoThousandElevenThreeYearPsuAwardsMember
2010 Three-year PSU Awards [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Restricted stock shares issued for new awards under the Omnibus Incentive Plan and 2005 Contingent Stock Plan |  |  | 472,865 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = see_TwoThousandTenThreeYearPsuAwardsMember |  |
2009 Three-year PSU Awards [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Restricted stock shares issued for new awards under the Omnibus Incentive Plan and 2005 Contingent Stock Plan |  |  |  | 1,155,018 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = see_TwoThousandNineThreeYearPsuAwardsMember |
Restricted Stock SLO Awards [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Restricted stock shares issued for SLO 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 |

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