Income Taxes - Schedule Showing Tax Effects of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Tax Liabilities:
Depreciation	$ (69,975)	$ (63,104)
Unrealized foreign exchange loss	(614)	(838)
Other	(950)	(1,159)
Deferred Tax Liabilities, Gross	(71,539)	(65,101)
Deferred Tax Assets:
Pensions	16,698	18,775
Deferred revenue	1,377	1,650
Other accruals and reserves	17,171	13,230
Inventories	1,833	1,957
Legal and environmental accruals	9,303	9,505
Deferred compensation	17,828	15,636
Bad debt and rebate reserves	3,685	4,618
Subsidiaries net operating loss carryforwards	602	727
Tax credit carryforwards	1,120	2,064
Deferred Tax Assets, Gross	69,617	68,162
Valuation Allowance	(1,443)	(1,506)
Net Deferred Tax (Liabilities)	(3,365)
Reconciliation to Consolidated Balance Sheet:
Current deferred tax assets		15,364
Non-current deferred tax assets (in other non-current assets)	6,090	2,044
Current deferred tax liabilities (in accrued liabilities)		(49)
Non-current deferred tax liabilities	(9,455)	(15,804)
Net Deferred Tax (Liabilities)	$ (3,365)
Net Deferred Tax Assets		$ 1,555