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Schedule of Notional Amount of Derivatives (Detail) (Foreign Currency Forward Contracts, USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	$ 10.0invest_DerivativeNotionalAmount	$ 25.2invest_DerivativeNotionalAmount
Buy Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	(31.5)invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_PositionAxis = us-gaap_LongMember	(24.8)invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_PositionAxis = us-gaap_LongMember
Sell Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	41.5invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_PositionAxis = us-gaap_ShortMember	50.0invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_PositionAxis = us-gaap_ShortMember
Japanese Yen
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	19.7invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_JPY	32.6invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_JPY
Japanese Yen | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	19.7invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_JPY / us-gaap_PositionAxis = us-gaap_ShortMember	32.6invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_JPY / us-gaap_PositionAxis = us-gaap_ShortMember
Taiwan Dollar
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	4.8invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_TWD	4.0invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_TWD
Taiwan Dollar | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	(0.9)invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_TWD / us-gaap_PositionAxis = us-gaap_LongMember
Taiwan Dollar | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	5.7invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_TWD / us-gaap_PositionAxis = us-gaap_ShortMember	4.0invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_TWD / us-gaap_PositionAxis = us-gaap_ShortMember
British Pound Sterling
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	11.7invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_GBP	6.9invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_GBP
British Pound Sterling | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	11.7invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_GBP / us-gaap_PositionAxis = us-gaap_ShortMember	6.9invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_GBP / us-gaap_PositionAxis = us-gaap_ShortMember
Korean Won
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	4.4invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_KRW	5.8invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_KRW
Korean Won | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	4.4invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_KRW / us-gaap_PositionAxis = us-gaap_ShortMember	5.8invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_KRW / us-gaap_PositionAxis = us-gaap_ShortMember
Euro
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	(30.6)invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_EUR	(24.1)invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_EUR
Euro | Buy Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts	(30.6)invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_EUR / us-gaap_PositionAxis = us-gaap_LongMember	(24.8)invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_EUR / us-gaap_PositionAxis = us-gaap_LongMember
Euro | Sell Position
Intercompany Foreign Currency Balance [Line Items]
Notional amounts		$ 0.7invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_EUR / us-gaap_PositionAxis = us-gaap_ShortMember

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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X

- Details

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- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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