Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended				6 Months Ended				6 Months Ended		1 Months Ended		6 Months Ended		1 Months Ended
	Jun. 30, 2012 Customer Relationships	Jun. 30, 2012 Other Intangible Assets	Jun. 30, 2012 Field Packaging Group	Apr. 14, 2011 Field Packaging Group	Jun. 30, 2012 Field Packaging Group Customer Relationships	Jun. 30, 2012 Field Packaging Group Other Intangible Assets	Jun. 30, 2012 Packaging Materials Company	Sep. 10, 2011 Packaging Materials Company	Jun. 30, 2012 Colorado Container	Nov. 30, 2011 Colorado Container	Nov. 30, 2011 Colorado Container Customer Relationships	Nov. 30, 2011 Colorado Container Other Intangible Assets	Jun. 30, 2012 Packaging Specialists	Mar. 16, 2012 Packaging Specialists	Mar. 16, 2012 Packaging Specialists Customer Relationships	Mar. 16, 2012 Packaging Specialists Other Intangible Assets
Business Acquisition [Line Items]
Business acquisition date			Apr. 14, 2011				Sep. 10, 2011		Nov. 30, 2011				Mar. 16, 2012
Business acquisition, cost of acquired entity				$ 26.9				$ 8.6		$ 21.8				$ 35.4
Purchase price allocation to goodwill			11.5					1.5		5.8
Business acquisition purchase price allocation, assets					9.5	0.2					5.8	0.2			11.4	0.3
Intangible asset, useful life, in years	18 years 2 months 12 days	3 years			10 years	3 years					10 years	3 years
Business acquisition purchase price allocation, goodwill														$ 14.0
Business acquisition, asset acquired useful life															10 years	3 years