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Long-Term Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended
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Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Revolving Credit Facility [Member] | Dec. 31, 2011 Revolving Credit Facility [Member] | Aug. 28, 2013 Revolving Credit Facility [Member] | Dec. 31, 2011 Revolving Credit Facility [Member] Minimum [Member] | Dec. 31, 2011 Revolving Credit Facility [Member] Maximum [Member] | Aug. 28, 2013 Additional Amount to be Committed by Lenders [Member] | Dec. 31, 2013 Promissory Note [Member] NewMarket Corporation [Member] Installment | Dec. 31, 2011 Promissory Note [Member] NewMarket Corporation [Member] | Dec. 31, 2013 Amended Credit Facility [Member] | Aug. 28, 2013 Amended Credit Facility [Member] Revolving Credit Facility [Member]
Schedule Of Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility term |  |  |  |  | 5 years |  |  |  |  |  |  |  |  | 5 years
Borrowing amount through revolving credit facility |  |  |  |  |  | $ 100 | $ 100 |  |  |  |  |  | $ 150 | $ 150
Margin rate based on U.S. dollar LIBOR |  |  |  |  |  |  |  | 1.50% | 2.25% |  |  |  |  |
Expiration date of facility |  |  |  |  | Dec. 31, 2016 | Dec. 14, 2016 |  |  |  |  |  |  |  |
Revolving credit facility, drawn down amount | 30.0 | 145.0 | 18.0 | 51.0 |  |  |  |  |  | 50.0 |  |  |  |
Maximum ratio of net debt to EBITDA |  | 2.5 |  |  |  |  |  |  |  |  |  |  |  |
Minimum ratio of EBITDA to net interest |  | 4.0 |  |  |  |  |  |  |  |  |  |  |  |
Promissory note issued |  |  |  |  |  |  |  |  |  |  |  | 15.0 |  |
Carrying simple interest per annum |  |  |  |  |  |  |  |  |  |  | 1.00% | 1.00% |  |
Number of repayment installment |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Weighted average rate of interest on borrowings | 1.60% | 1.60% | 1.60% |  |  |  |  |  |  |  |  |  |  |
Payments of interest on long-term debt |  | 1.0 | 0.5 | 1.8 |  |  |  |  |  |  |  |  |  |
Net cash outflows in respect of refinancing costs |  | $ 0.9 | $ 0 | $ 1.7 |  |  |  |  |  |  |  |  |  |

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