Income Taxes - Schedule Showing Tax Effects of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Deferred Tax Assets:
Pensions	$ 1,862,000	$ 1,467,000
Deferred revenue	2,243,000	2,067,000
Other accruals and reserves	8,961,000	12,324,000
Legal and environmental accruals	7,409,000	7,244,000
Deferred compensation	7,261,000	9,361,000
Bad debt and rebate reserves	4,252,000	4,950,000
Net operating loss carryforwards	26,124,000	7,615,000
Amortization of intangibles	52,355,000	52,868,000
Inventories	6,337,000	8,004,000
Tax credit carryforwards	22,786,000	19,383,000
Disallowed interest expense carryforwards	0	6,035,000
Deferred Tax Assets, Gross	139,590,000	131,318,000
Deferred Tax Liabilities:
Depreciation	(100,120,000)	(94,012,000)
Unrealized foreign exchange loss	(3,166,000)	(3,222,000)
Other	(3,243,000)	(2,878,000)
Deferred Tax Liabilities, Gross	(106,529,000)	(100,112,000)
Valuation Allowance	(776,000)	(764,000)
Net Deferred Tax Assets	32,285,000	30,442,000
Reconciliation to Consolidated Balance Sheet:
Non-current deferred tax assets (in other non-current assets)	43,735,000	40,054,000
Non-current deferred tax liabilities	$ (11,450,000)	$ (9,612,000)