Income Taxes - Schedule Showing Tax Effects of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Liabilities:
Depreciation	$ (57,665)	$ (51,244)
Unrealized foreign exchange loss	(980)	(734)
Amortization of intangibles	(1,016)	(1,420)
Inventories	(725)
Other	(301)	(646)
Deferred Tax Liabilities, Gross	(60,687)	(54,044)
Deferred Tax Assets:
Pensions	7,971	7,884
Deferred revenue	208	232
Other accruals and reserves	13,123	13,660
Inventories		1,182
Legal and environmental accruals	7,143	7,243
Deferred compensation	14,214	15,402
Bad debt and rebate reserves	2,916	2,865
Non-U.S. subsidiaries net operating loss carryforwards	3,869	2,657
Tax credit carryforwards	2,141	1,851
Deferred Tax Assets, Gross	51,585	52,976
Valuation Allowance	(3,701)	(2,255)
Net Deferred Tax Liabilities	(12,803)	(3,323)
Reconciliation to Consolidated Balance Sheet:
Non-current deferred tax assets (in other non-current assets)	5,869	7,639
Non-current deferred tax liabilities	$ (18,672)	$ (10,962)