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Plant Closure Provisions - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Expenditure $ 2.4 $ 2.7 $ 2.6
Huntsman [Member]      
Restructuring Cost and Reserve [Line Items]      
Asset retirement obligations 2.8    
Remediation [Member]      
Restructuring Cost and Reserve [Line Items]      
Accretion expense recognized 3.5    
Remediation charge for changes in the scope and cost of future remediation activities $ 2.4    
Discount rate of remediation provision 8.92%    
Expenditure $ 2.4 $ 2.7 $ 2.6