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Derivatives - Narrative (Detail) - Not Designated as Hedging Instrument - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Accrued Liabilities and Other    
Derivative [Line Items]    
Derivatives liabilities $ 1.0  
Prepaid Expenses and Other Current Assets    
Derivative [Line Items]    
Derivatives assets 2.1 $ 2.2
Foreign Currency Contracts    
Derivative [Line Items]    
Aggregate notional value $ 124.2 $ 215.9