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Acquisition - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 1 Months Ended 1 Months Ended
Mar. 31, 2013
Customer Relationships
Mar. 31, 2013
Other Intangible Assets
Mar. 16, 2012
Packaging Specialists
Mar. 31, 2012
Packaging Specialists
Customer Relationships
Mar. 16, 2012
Packaging Specialists
Customer Relationships
Mar. 31, 2012
Packaging Specialists
Other Intangible Assets
Mar. 16, 2012
Packaging Specialists
Other Intangible Assets
Business Acquisition [Line Items]              
Business acquisition, cost of acquired entity     $ 35.5        
Purchase price allocation to goodwill deductible for tax purposes     9.6        
Purchase price allocation to intangible assets         $ 15.5   $ 0.6
Intangible asset, useful life, in years 16 years 7 months 6 days 2 years 8 months 12 days   15 years   4 years