Income Taxes - Schedule Showing Tax Effects of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Deferred Tax Assets:
Pensions	$ 1,467,000	$ 446,000
Deferred revenue	2,067,000	2,640,000
Other accruals and reserves	12,324,000	14,638,000
Legal and environmental accruals	7,244,000	7,292,000
Deferred compensation	9,361,000	12,199,000
Bad debt and rebate reserves	4,950,000	4,916,000
Net operating loss carryforwards	7,615,000	6,512,000
Amortization of intangibles	52,868,000	37,123,000
Inventories	8,004,000	8,959,000
Tax credit carryforwards	19,383,000	13,682,000
Disallowed interest expense carryforwards	6,035,000
Deferred Tax Assets, Gross	131,318,000	108,407,000
Deferred Tax Liabilities:
Depreciation	(94,012,000)	(82,907,000)
Unrealized foreign exchange loss	(3,222,000)	(2,784,000)
Other	(2,878,000)	(2,991,000)
Deferred Tax Liabilities, Gross	(100,112,000)	(88,682,000)
Valuation Allowance	(764,000)	(853,000)
Net Deferred Tax Assets	30,442,000	18,872,000
Reconciliation to Consolidated Balance Sheet:
Non-current deferred tax assets (in other non-current assets)	40,054,000	29,245,000
Non-current deferred tax liabilities	$ (9,612,000)	$ (10,373,000)