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Long-Term Debt (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Long Term Debt (Additional Textual) [Abstract] |  |  |
Maximum ratio of net debt to EBITDA | 2.5 |  |
Minimum ratio of EBITDA to net interest | 4.0 |  |
Weighted average rate of interest on borrowings | 1.60% | 3.40% |
Payments of interest on long-term debt | $ 0.5 | $ 1.8 | $ 2.0
Net cash outflows in respect of refinancing costs | 0 | 1.7 | 0
Revolving Credit Facility [Member] |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |
Revolving credit facility term | 5 years |  |
Borrowing amount through revolving credit facility |  | 100.0 |
Expiration date of facility |  | Dec. 14, 2016 |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |
Margin rate based on U.S. LIBOR |  | 2.25% |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |
Margin rate based on U.S. LIBOR |  | 1.50% |
NewMarket Corporation [Member] |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |
Carrying simple interest per annum | 1.00% |  |
NewMarket Corporation [Member] | Promissory note [Member] |  |  |
Long-Term Debt (Textual) [Abstract] |  |  |
Promissory note issued |  | $ 15.0 |
Carrying simple interest per annum |  | 1.00% |
Number of repayment installment | 3 |  |

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- Definition Maximum debt to earning before interest tax depreciation and amortization ratio. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-13 -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. + Details
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