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Accounts Receivable - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable, allowances for doubtful accounts $ 22.0 $ 20.4 $ 21.5