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Other Expense (Income), Net - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Component Of Other Expense Income Nonoperating [Line Items]      
Impairment charge $ 0us-gaap_AssetImpairmentCharges $ 21.2us-gaap_AssetImpairmentCharges $ 13.2us-gaap_AssetImpairmentCharges
Carrying value of the investment $ 0us-gaap_CostMethodInvestments