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Derivatives and Hedging Activities (Narrative) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Termination value of obligations	$ 23,000,000us-gaap_AssetsNeededForImmediateSettlementAggregateFairValue
Goldman Sachs [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash collateral deposit	28,151,000us-gaap_CollateralAlreadyPostedAggregateFairValue / us-gaap_DerivativeByNatureAxis = neu_GoldmanSachsMember	27,783,000us-gaap_CollateralAlreadyPostedAggregateFairValue / us-gaap_DerivativeByNatureAxis = neu_GoldmanSachsMember
Interest Rate Swap [Member] | Goldman Sachs [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	97,000,000us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeByNatureAxis = neu_GoldmanSachsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Rate of fixed-rate payments for interest rate swap	5.3075%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = neu_GoldmanSachsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Cash collateral deposit	$ 28,151,000us-gaap_CollateralAlreadyPostedAggregateFairValue / us-gaap_DerivativeByNatureAxis = neu_GoldmanSachsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember	$ 27,783,000us-gaap_CollateralAlreadyPostedAggregateFairValue / us-gaap_DerivativeByNatureAxis = neu_GoldmanSachsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

X

- Definition

The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Details

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- Details

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