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Information on Business Segments - Net Sales and Operating Income by Segment (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Purchases of property,plant and equipment not yet paid $ 4.2us-gaap_PaymentsToAcquireProductiveAssets $ 0.2us-gaap_PaymentsToAcquireProductiveAssets $ 3.4us-gaap_PaymentsToAcquireProductiveAssets