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Schedule of Notional Amount of Derivatives (Detail) - Foreign Currency Forward Contracts - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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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

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