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Net Earnings (Loss) per Common Share - Additional Information (Detail) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |  |
Diluted | 213.9 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 214.2 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 192.8 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1]
Performance Stock Units [Member] |  |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |  |
Diluted | 1.0 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_AwardTypeAxis = see_PerformanceStockUnitsMember | 1.0 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_AwardTypeAxis = see_PerformanceStockUnitsMember |  | 0 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_AwardTypeAxis = see_PerformanceStockUnitsMember |
[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.

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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