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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