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Segment Reporting and Geographical Area Data - Segment Reporting (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Net sales $ 1,012,300,000 $ 960,900,000 $ 818,800,000
Gross profit 346,000,000 302,000,000 255,200,000
Operating income 156,300,000 112,500,000 90,600,000
Adjustment to fair value of contingent consideration 40,700,000 1,900,000 0
Profit on disposal of subsidiary 1,600,000 0 0
Impairment of Octane Additives segment goodwill 0 0 (1,300,000)
Identifiable assets at year end 1,030,000,000 999,900,000 794,700,000
Fuel Specialties [Member]      
Segment Reporting Information [Line Items]      
Impairment of Octane Additives segment goodwill 0 0 0
Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Impairment of Octane Additives segment goodwill 0 0 0
Operating Segments [Member] | Fuel Specialties [Member]      
Segment Reporting Information [Line Items]      
Net sales 758,300,000 682,200,000 567,400,000
Gross profit 265,100,000 219,000,000 181,100,000
Operating income 103,900,000 104,400,000 92,700,000
Identifiable assets at year end 633,000,000 676,900,000 446,400,000
Operating Segments [Member] | Performance Chemicals [Member]      
Segment Reporting Information [Line Items]      
Net sales 194,500,000 223,500,000 192,400,000
Gross profit 52,400,000 54,400,000 46,300,000
Operating income 23,500,000 25,600,000 23,600,000
Identifiable assets at year end 137,000,000 181,000,000 176,800,000
Operating Segments [Member] | Octane Additives [Member]      
Segment Reporting Information [Line Items]      
Net sales 59,500,000 55,200,000 59,000,000
Gross profit 28,500,000 28,600,000 27,800,000
Operating income 24,700,000 22,600,000 21,500,000
Identifiable assets at year end 28,700,000 29,200,000 42,000,000
Segment Reconciling Items [Member]      
Segment Reporting Information [Line Items]      
Pension credit/(charge) 200,000 (3,300,000) (2,300,000)
Profit on disposal of subsidiary 1,600,000 0 0
Impairment of Octane Additives segment goodwill 0 0 (1,300,000)
Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Corporate costs (38,300,000) (38,700,000) (43,600,000)
Identifiable assets at year end $ 231,300,000 $ 112,800,000 $ 129,500,000