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Schedule of Notional Amount of Derivatives (Detail) - Foreign Currency Forward Contracts - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts $ 14.5 $ (29.7)
Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (34.7) (71.9)
Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts 49.2 42.2
Japanese Yen    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (17.7) (51.9)
Japanese Yen | Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (17.7) (51.9)
British Pound Sterling    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (1.3) (9.5)
British Pound Sterling | Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (1.3) (9.5)
Korean Won    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (8.8) (5.5)
Korean Won | Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (8.8) (5.5)
Taiwan Dollar    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (6.9) (5.0)
Taiwan Dollar | Buy Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts (6.9) (5.0)
Euro    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts 25.2 27.2
Euro | Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts 25.2 27.2
Singapore Dollar    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts 24.0 15.0
Singapore Dollar | Sell Position    
Intercompany Foreign Currency Balance [Line Items]    
Notional amounts $ 24.0 $ 15.0