Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended				9 Months Ended				9 Months Ended		1 Months Ended		9 Months Ended		1 Months Ended
	Sep. 30, 2012 Customer Relationships	Sep. 30, 2012 Other Intangible Assets	Sep. 30, 2012 Field Packaging Group	Apr. 14, 2011 Field Packaging Group	Sep. 30, 2012 Field Packaging Group Customer Relationships	Sep. 30, 2012 Field Packaging Group Other Intangible Assets	Sep. 30, 2012 Packaging Materials Company	Sep. 10, 2011 Packaging Materials Company	Sep. 30, 2012 Colorado Container	Nov. 30, 2011 Colorado Container	Nov. 30, 2011 Colorado Container Customer Relationships	Nov. 30, 2011 Colorado Container Other Intangible Assets	Sep. 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
Business acquisition purchase price allocation, goodwill			11.5					1.5		5.8				14.1
Business acquisition purchase price allocation, assets					$ 9.5	$ 0.2					$ 5.8	$ 0.2			$ 11.4	$ 0.3
Business acquisition, asset acquired useful life	18 years 2 months 12 days	3 years			10 years	3 years					10 years	3 years			10 years	3 years