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Derivatives and Hedging Activities (Fair Value Of Derivative Instruments) (Details) (Goldman Sachs [Member], Interest Rate Swap [Member], Accrued Expenses And Other Noncurrent Liabilities [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Goldman Sachs [Member] | Interest Rate Swap [Member] | Accrued Expenses And Other Noncurrent Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Fair value of liability derivatives, not designated as hedging instruments	$ 23,294us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = neu_AccruedExpensesAndOherNoncurrentLiabilitiesMember / us-gaap_DerivativeByNatureAxis = neu_GoldmanSachsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember	$ 23,389us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = neu_AccruedExpensesAndOherNoncurrentLiabilitiesMember / us-gaap_DerivativeByNatureAxis = neu_GoldmanSachsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

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- Details

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- Definition

Fair value as of the balance sheet date of all derivative liabilities not designated as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

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