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Commitments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitment And Contingencies [Line Items]      
Purchase obligations $ 366.7us-gaap_PurchaseObligation    
Purchase obligations due in one year 356.7us-gaap_PurchaseObligationDueInNextTwelveMonths    
Operating leases, rent expense net $ 33.4us-gaap_OperatingLeasesRentExpenseNet $ 29.0us-gaap_OperatingLeasesRentExpenseNet $ 27.4us-gaap_OperatingLeasesRentExpenseNet