Schedule of Notional Amount of Derivatives (Detail) (Foreign Exchange Contract, USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	$ 25.2	$ 30.5
Buy Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	(24.8)	(16.8)
Sell Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	50.0	47.3
Japanese Yen
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	32.6	36.3
Japanese Yen | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	32.6	36.3
Taiwan Dollar
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	4.0	4.2
Taiwan Dollar | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	4.0	4.2
British Pound Sterling
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	6.9	5.5
British Pound Sterling | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	6.9	5.5
Euro
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	(24.1)	(15.5)
Euro | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	(24.8)	(16.8)
Euro | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	0.7	1.3
Korean Won
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	5.8
Korean Won | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	$ 5.8