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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Aug. 09, 2007
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock Repurchase Program Number Of Shares Authorized To Be Repurchased |  |  |  | 20,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Common stock repurchase value | $ 524.9 us-gaap_TreasuryStockValue | $ 524.9 us-gaap_TreasuryStockValue | $ 481.4 us-gaap_TreasuryStockValue |
Accelerated Shares Repurchase Agreement [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock repurchase value | 25.0 us-gaap_TreasuryStockValue / us-gaap_ShareRepurchaseProgramAxis = see_ASRAgreementMember | 25.0 us-gaap_TreasuryStockValue / us-gaap_ShareRepurchaseProgramAxis = see_ASRAgreementMember |  |
Number of common stock shares repurchased | 433,181 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = see_ASRAgreementMember |  |  |
Common stock repurchase price per share | $ 46.17 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = see_ASRAgreementMember |  |  |
Remaining additional paid in capital | 5 us-gaap_AdditionalPaidInCapitalCommonStock / us-gaap_ShareRepurchaseProgramAxis = see_ASRAgreementMember | 5 us-gaap_AdditionalPaidInCapitalCommonStock / us-gaap_ShareRepurchaseProgramAxis = see_ASRAgreementMember |  |
Initial Delivery [Member] | Accelerated Shares Repurchase Agreement [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock repurchase value | 20.0 us-gaap_TreasuryStockValue / us-gaap_ShareRepurchaseProgramAxis = see_ASRAgreementMember / us-gaap_SubsidiarySaleOfStockAxis = see_InitialDeliveryMember | 20.0 us-gaap_TreasuryStockValue / us-gaap_ShareRepurchaseProgramAxis = see_ASRAgreementMember / us-gaap_SubsidiarySaleOfStockAxis = see_InitialDeliveryMember |  |
Share Trading Plan [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock repurchase value | $ 44.0 us-gaap_TreasuryStockValue / us-gaap_PlanNameAxis = see_ShareTradingPlanMember | $ 44.0 us-gaap_TreasuryStockValue / us-gaap_PlanNameAxis = see_ShareTradingPlanMember |  |
Number of common stock shares repurchased |  | 1,014,147 us-gaap_TreasuryStockSharesAcquired / us-gaap_PlanNameAxis = see_ShareTradingPlanMember |  |

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- Definition Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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