Income Taxes - Schedule Showing Tax Effects of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Liabilities:
Depreciation		$ (59,574)	$ (57,665)
Unrealized foreign exchange loss		(1,479)	(980)
Amortization of intangibles		(835)	(1,016)
Inventories	[1]	(5,855)	(8,429)
Other		(307)	(301)
Deferred Tax Liabilities, Gross		(68,050)	(68,391)
Deferred Tax Assets:
Pensions		5,855	7,971
Deferred revenue		161	208
Other accruals and reserves		12,171	13,123
Legal and environmental accruals		7,758	7,143
Deferred compensation		15,816	14,214
Bad debt and rebate reserves		2,604	2,916
Non-U.S. subsidiaries net operating loss carryforwards		3,966	3,869
Tax credit carryforwards		5,200	2,141
Deferred Tax Assets, Gross		53,531	51,585
Valuation Allowance		(2,994)	(3,701)
Net Deferred Tax Liabilities		(17,513)	(20,507)
Reconciliation to Consolidated Balance Sheet:
Non-current deferred tax assets (in other non-current assets)	[1]	5,878	4,454
Non-current deferred tax liabilities	[1]	$ (23,391)	$ (24,961)

[1] The 2018 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO.