Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Basis Of Presentation And Significant Accounting Policies [Line Items]
Percentage owned manufacturing joint venture under equity method investment	50.00%
Capitalized interest costs on property and equipment	$ 2,200,000	$ 1,000,000	$ 1,100,000
Percentage of likelihood for recognition of uncertain tax positions	50.00%
Recognition of receivables for recoveries	$ 0	0
Advertising costs	1,000,000	1,000,000	1,000,000
Research, development and certain sales technical support costs	20,000,000	13,000,000	16,000,000
Chemicals
Basis Of Presentation And Significant Accounting Policies [Line Items]
Shipping and handling costs	$ 101,000,000	90,000,000	87,000,000
Contran
Basis Of Presentation And Significant Accounting Policies [Line Items]
Parent company ownership interest	93.00%
Net cash payments received from/paid to tax group parent	$ 38,900,000	$ 10,700,000	$ 2,500,000