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Commitments and Contingencies (Environmental) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Site Contingency [Line Items]
Accruals for environmental remediation, dismantling, and decontamination	$ 18us-gaap_AccrualForEnvironmentalLossContingencies	$ 18us-gaap_AccrualForEnvironmentalLossContingencies
Former TEL Plant Site Louisiana And Houston Texas Plant Site [Member]
Site Contingency [Line Items]
Accruals for environmental remediation, dismantling, and decontamination	11us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_EnvironmentalRemediationSiteAxis = neu_FormerTELPlantSiteLouisianaAndHoustonTexasPlantSiteMember	11us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_EnvironmentalRemediationSiteAxis = neu_FormerTELPlantSiteLouisianaAndHoustonTexasPlantSiteMember
Accruals for environmental remediation, dismantling, and decontamination, undiscounted	15us-gaap_AccrualForEnvironmentalLossContingenciesGross / us-gaap_EnvironmentalRemediationSiteAxis = neu_FormerTELPlantSiteLouisianaAndHoustonTexasPlantSiteMember	15us-gaap_AccrualForEnvironmentalLossContingenciesGross / us-gaap_EnvironmentalRemediationSiteAxis = neu_FormerTELPlantSiteLouisianaAndHoustonTexasPlantSiteMember
Former TEL Plant Site, Louisiana [Member]
Site Contingency [Line Items]
Accrual for remediation of groundwater and soil	5neu_AccrualForEnvironmentalRemediationOfGroundWaterAndSoil / us-gaap_EnvironmentalRemediationSiteAxis = neu_FormerTelPlantSiteLouisianaMember	5neu_AccrualForEnvironmentalRemediationOfGroundWaterAndSoil / us-gaap_EnvironmentalRemediationSiteAxis = neu_FormerTelPlantSiteLouisianaMember
Houston, Texas Plant Site [Member]
Site Contingency [Line Items]
Accrual for remediation of groundwater and soil	$ 5neu_AccrualForEnvironmentalRemediationOfGroundWaterAndSoil / us-gaap_EnvironmentalRemediationSiteAxis = neu_HoustonTexasPlantSiteMember	$ 6neu_AccrualForEnvironmentalRemediationOfGroundWaterAndSoil / us-gaap_EnvironmentalRemediationSiteAxis = neu_HoustonTexasPlantSiteMember
Minimum [Member] | Former TEL Plant Site Louisiana And Houston Texas Plant Site [Member]
Site Contingency [Line Items]
Discount rate	3.00%us-gaap_AccrualForEnvironmentalLossContingenciesDiscountRate / us-gaap_EnvironmentalRemediationSiteAxis = neu_FormerTELPlantSiteLouisianaAndHoustonTexasPlantSiteMember / us-gaap_RangeAxis = us-gaap_MinimumMember	3.00%us-gaap_AccrualForEnvironmentalLossContingenciesDiscountRate / us-gaap_EnvironmentalRemediationSiteAxis = neu_FormerTELPlantSiteLouisianaAndHoustonTexasPlantSiteMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] | Former TEL Plant Site Louisiana And Houston Texas Plant Site [Member]
Site Contingency [Line Items]
Discount rate	9.00%us-gaap_AccrualForEnvironmentalLossContingenciesDiscountRate / us-gaap_EnvironmentalRemediationSiteAxis = neu_FormerTELPlantSiteLouisianaAndHoustonTexasPlantSiteMember / us-gaap_RangeAxis = us-gaap_MaximumMember	9.00%us-gaap_AccrualForEnvironmentalLossContingenciesDiscountRate / us-gaap_EnvironmentalRemediationSiteAxis = neu_FormerTELPlantSiteLouisianaAndHoustonTexasPlantSiteMember / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

The component of the environmental loss contingency accrual that is specifically related to remediation of groundwater and soil.

+ References

No definition available.

+ Details

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Namespace Prefix:	neu_
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Balance Type:	credit
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X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 30

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

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

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-SubTopic 20

-Section 25

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X

- Definition

Rate applied to the undiscounted amount of environmental loss contingencies to arrive at the present value recorded as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.Y.Q1)

-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751



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-Publisher SEC

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-Number Topic 5

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

-Publisher FASB

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-Topic 410

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- Definition

Undiscounted amount of the accrual for environmental loss contingencies.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.Y.Q1)

-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751



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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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-Topic 410

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-Paragraph 7

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