Debt - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2010	May 27, 2015	May 26, 2015
Debt Instrument [Line Items]
Effect of tax exemption granted to Texarkana Industrial Revenue Bonds (as a percent)				100.00%
Assets associated with city of Texarkana	$ 24,100,000	$ 20,000,000
Liabilities associated with city of Texarkana	24,100,000	20,000,000
Short-term notes payable	$ 39,450,000	$ 26,286,000
Weighted average interest rate of short term notes payable (as a percent)	4.46%	4.26%
Interest paid	$ 34,085,000	$ 28,842,000	$ 27,560,000
Interest capitalized	2,706,000	3,016,000	$ 4,473,000
Letter of Credit
Debt Instrument [Line Items]
Amounts used to secure letters of credit	17,600,000	21,800,000
Bank Group And Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Additional borrowing capacity	527,600,000
Asian Credit Lines
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	63,600,000
Additional borrowing capacity	24,200,000
Accounts Receivable Facility Before May 27, 2015 | Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 175,000,000
Amended Accounts Receivable Facility | Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 150,000,000
Borrowings outstanding	0	0
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					400,000,000
Increase in line credit facility (up to)					100,000,000
Borrowings outstanding	0	$ 0
Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 110,000,000
Secured Notes
Debt Instrument [Line Items]
Secured notes outstanding	$ 0