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Consolidating Financial Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Senior notes, interest rate	7.125%
Guarantor Subsidiaries [Member]
Percent ownership by Parent Company	100.00%
Non-Guarantor Subsidiaries [Member]
Percent ownership by Parent Company	100.00%
Senior Notes-7.125% Due 2016 [Member]
Senior notes, interest rate	7.125%	7.125%
Debt instrument, maturity date	2016

X

- Definition

Debt instruments maturity date.

+ References

No definition available.

+ Details

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Namespace Prefix:	neu_
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Balance Type:	na
Period Type:	duration

X

- Definition

Percentage ownership interest by parent.

+ References

No definition available.

+ Details

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Namespace Prefix:	neu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Interest rate stated in the contractual debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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