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Segment Reporting - Summary of Segment Depreciation and Amortization (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Summary of segment depreciation and amortization        
Depreciation $ 3.0 $ 2.5 $ 9.5 $ 7.9
Amortization 5.2 3.9 15.6 12.7
Operating Segments [Member] | Fuel Specialties [Member]        
Summary of segment depreciation and amortization        
Depreciation 2.0 1.0 5.9 3.2
Amortization 3.3 1.9 9.7 6.2
Operating Segments [Member] | Performance Chemicals [Member]        
Summary of segment depreciation and amortization        
Depreciation 0.6 0.9 2.2 2.8
Amortization 1.0 1.1 3.1 3.7
Operating Segments [Member] | Octane Additives [Member]        
Summary of segment depreciation and amortization        
Depreciation 0.1 0.1 0.3 0.3
Corporate, Non-Segment [Member]        
Summary of segment depreciation and amortization        
Depreciation 0.3 0.5 1.1 1.6
Amortization $ 0.9 $ 0.9 $ 2.8 $ 2.8