Income Taxes - Schedule Showing Tax Effects of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Liabilities:
Depreciation	$ (51,244)	$ (75,973)
Unrealized foreign exchange loss	(734)	(631)
Other	(2,066)	(2,756)
Deferred Tax Liabilities, Gross	(54,044)	(79,360)
Deferred Tax Assets:
Pensions	7,884	12,077
Deferred revenue	232	940
Other accruals and reserves	13,660	20,590
Inventories	1,182	1,815
Legal and environmental accruals	7,243	11,503
Deferred compensation	15,402	24,485
Bad debt and rebate reserves	2,865	4,195
Non-U.S. subsidiaries net operating loss carryforwards	2,657	1,201
Tax credit carryforwards	1,851	1,599
Deferred Tax Assets, Gross	52,976	78,405
Valuation Allowance	(2,255)	(1,815)
Net Deferred Tax Liabilities	(3,323)	(2,770)
Reconciliation to Consolidated Balance Sheet:
Non-current deferred tax assets (in other non-current assets)	7,639	9,727
Non-current deferred tax liabilities	$ (10,962)	$ (12,497)