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Segment Information - Segment Financial Information (Parenthetical) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Impairment of long-lived assets $ 43,188,000    
Interest cost capitalized 30,600,000 $ 14,100,000 $ 4,000,000
Chemical [Member]      
Segment Reporting Information [Line Items]      
Property insurance recoveries 0 5,100,000 66,300,000
Non-cash impairment charge 39,700,000    
Chemical [Member] | Pryor Facility [Member]      
Segment Reporting Information [Line Items]      
Impairment of long-lived assets 3,500,000    
Cost of Sales [Member] | Chemical [Member]      
Segment Reporting Information [Line Items]      
Business interruption loss $ 0 $ 22,900,000 $ 28,400,000