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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
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