Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Foreign currency transaction (losses) gains									$ (10,400)	$ 600	$ (500)
Period for payment of approval basis sale									30 days
Net sales	$ 363,700	$ 433,800	$ 431,600	$ 397,800	$ 426,700	$ 440,100	$ 356,800	$ 331,400	$ 1,626,900	1,555,000	1,478,300
Research and development costs									$ 5,200	$ 3,400	2,400
Percentage of LIFO inventory	66.00%				61.00%				66.00%	61.00%
China [Member]
Summary Of Significant Accounting Policies [Line Items]
Agreement period									50 years
Other Current Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Prepaid expenses	$ 17,000				$ 20,600				$ 17,000	$ 20,600
Buildings [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives									10 years
Buildings [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives									20 years
Machinery and Equipment [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives									3 years
Machinery and Equipment [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives									10 years
Untreated Crosstie Sales [Member]
Summary Of Significant Accounting Policies [Line Items]
Net sales									$ 129,800	$ 93,400	$ 108,300