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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Summary of segment depreciation and amortization        
Depreciation $ 2.6 $ 2.1 $ 5.4 $ 4.4
Amortization 4.4 2.1 8.8 4.2
Operating Segments [Member] | Fuel Specialties [Member]
        
Summary of segment depreciation and amortization        
Depreciation 1.0 0.6 2.2 1.2
Amortization 2.1 1.6 4.3 3.2
Operating Segments [Member] | Performance Chemicals [Member]
        
Summary of segment depreciation and amortization        
Depreciation 1.0 0.8 1.9 1.7
Amortization 1.3 0.3 2.6 0.7
Operating Segments [Member] | Octane Additives [Member]
        
Summary of segment depreciation and amortization        
Depreciation 0.1 0.2 0.2 0.4
Amortization 0 0.2 0 0.3
Corporate, Non-Segment [Member]
        
Summary of segment depreciation and amortization        
Depreciation 0.5 0.5 1.1 1.1
Amortization $ 1.0 $ 0 $ 1.9 $ 0