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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 19, 2012 | Sep. 30, 2011 | Mar. 31, 2010 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Commitment And Contingencies [Line Items] |  |  |  |  |  |
Operating leases, rent expense |  |  |  | $ 3.1 | $ 2.9 | $ 2.6
Settlement to resolve investigation matter |  |  | 40.2 |  |  |
Litigation Settlement period for payment |  |  |  | 4 years |  |
Stated claim inclusive of costs and expenses | 42.3 |  |  |  |  |
Promissory note issued |  |  |  | 15.0 |  |
Payment made in the form of stock |  | 5.0 |  |  |  |
Stock issued for payment |  | 195,313 |  | 0 | 0 | 0
Contingent liabilities |  |  |  | 3.8 |  |
NewMarket Corporation [Member] |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |
Settlement to resolve investigation matter |  |  |  | 45.0 |  |
Litigation settlement amount paid |  | $ 25.0 |  |  |  |
NewMarket Corporation [Member] | Promissory Note [Member] |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |
Carrying simple interest per annum |  |  |  | 1.00% |  | 1.00%
Number of repayment installment |  |  |  | 3 |  |

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- Definition Contractual interest rate for funds borrowed, under the 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 + Details
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