Income Taxes - Components of Deferred Income Tax Balances (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred income tax liabilities:
Plant, equipment and intangibles	$ (97,229)	$ (89,433)
Deferred income tax assets:
Postretirement, pensions, and stock compensation	27,592	44,814
Reserves and accruals	33,788	22,042
Net operating loss and tax credit carryforwards	88,307	84,716
Valuation allowances	(10,165)	(7,498)
Deferred tax assets	139,522	144,074
Net deferred income tax asset	$ 42,293	$ 54,641