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Commitments and Contingencies (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2011	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies (Additional Textual) [Abstract]
Settlement to resolve investigation matter		$ 40.2
Commitments and Contingencies (Textual) [Abstract]
Operating Leases, Rent Expense			2.9	2.6	2.8
Litigation settlement period for payment			4 years
Promissory note issued			15.0
Loss contingent first date of repayment of promissory notes			Sep. 07, 2012
Payment made in the form of stock	5.0
Stock issued for payment	195,313
Contingent liabilities			7.7
NewMarket Corporation [Member]
Commitments and Contingencies (Additional Textual) [Abstract]
Settlement to resolve investigation matter			45.0
Litigation Settlement Amount paid	$ 25.0
Carrying simple interest per annum			1.00%
NewMarket Corporation [Member] | Promissory note [Member]
Commitments and Contingencies (Additional Textual) [Abstract]
Number of repayment installment			3
Carrying simple interest per annum				1.00%

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- Definition

Litigation settlement amount paid.

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- Definition

Litigation settlement period for payment.

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Loss contingent first date of repayment of promissory notes.

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Number of repayment installment.

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Promissory note issued.

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Stock issued during period share for contingent loss settlement.

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- 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))

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

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-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248



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

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-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

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This element represents the gross amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period.

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