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Stockholder's Equity - Stockholder's Equity (Detail)
 1 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity [Abstract]        
Common Stock, Beginning balance   29,554,500 29,554,500 29,554,500
Treasury Stock, Beginning balance   6,222 6,507 5,851
Exercise of options   0 0 0
Exercise of options, Treasury Stock   (632) (333) (236)
Acquisition-related stock issued   0 0 0
Acquisition-related stock issued, Treasury Stock   (471) 0 0
Stock purchases   0 0 0
Stock purchases, Treasury Stock   89 48 1,087
Settlement of NewMarket Corporation civil complaint 195,313 0 0 0
Settlement of NewMarket Corporation civil complaint, Treasury Stock   0 0 (195)
Common stock, Ending balance   29,554,500 29,554,500 29,554,500
Ending balance, Treasury Stock   5,208 6,222 6,507