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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
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Intercompany Foreign Currency Balance [Line Items] |  |
Notional amounts | $ 10.0 invest_DerivativeNotionalAmount | $ 25.2 invest_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 | 41.5 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_PositionAxis = us-gaap_ShortMember | 50.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_PositionAxis = us-gaap_ShortMember
Japanese Yen |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Notional amounts | 19.7 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_JPY | 32.6 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_JPY
Japanese Yen | Sell Position |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Notional amounts | 19.7 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_JPY / us-gaap_PositionAxis = us-gaap_ShortMember | 32.6 invest_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 | 4.8 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_TWD | 4.0 invest_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 | 5.7 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_TWD / us-gaap_PositionAxis = us-gaap_ShortMember | 4.0 invest_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 | 11.7 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_GBP | 6.9 invest_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 | 11.7 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_GBP / us-gaap_PositionAxis = us-gaap_ShortMember | 6.9 invest_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 | 4.4 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_KRW | 5.8 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_KRW
Korean Won | Sell Position |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Notional amounts | 4.4 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_KRW / us-gaap_PositionAxis = us-gaap_ShortMember | 5.8 invest_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 |  | $ 0.7 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_IntercompanyForeignCurrencyBalanceByDescriptionAxis = currency_EUR / us-gaap_PositionAxis = us-gaap_ShortMember

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- 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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