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Segmental Reporting - Summary of Segment Depreciation and Amortization (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Summary of segment depreciation and amortization        
Depreciation $ 2.1 $ 1.7 $ 4.4 $ 3.3
Amortization 2.1 1.0 4.2 2.0
Operating Segments [Member] | Fuel Specialties [Member]
        
Summary of segment depreciation and amortization        
Depreciation 0.6 0.5 1.2 1.0
Amortization 1.6 0.5 3.2 1.0
Operating Segments [Member] | Performance Chemicals [Member]
        
Summary of segment depreciation and amortization        
Depreciation 0.8 0.6 1.7 1.2
Amortization 0.3 0.4 0.7 0.7
Operating Segments [Member] | Octane Additives [Member]
        
Summary of segment depreciation and amortization        
Depreciation 0.2 0.2 0.4 0.3
Amortization 0.2 0.1 0.3 0.3
Corporate, Non-Segment [Member]
        
Summary of segment depreciation and amortization        
Depreciation $ 0.5 $ 0.4 $ 1.1 $ 0.8