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Allowance for Doubtful Accounts Included in Accounts Receivable Net (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Valuation Allowance [Line Items]      
Allowance for Doubtful Accounts $ 2.1 $ 1.6 $ 2.5