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Stockholders' Equity - Total Share-based Compensation Expense (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based incentive compensation $ 54.1us-gaap_ShareBasedCompensation $ 24.1us-gaap_ShareBasedCompensation [1] $ 16.9us-gaap_ShareBasedCompensation [1]
2013 WVH Incentive Compensation [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based incentive compensation $ 1.3us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= see_TwoThousandThirteenWvhIncentiveCompensationMember		 $ 2.5us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= see_TwoThousandThirteenWvhIncentiveCompensationMember		  
[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.