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Income Taxes - Components of Deferred Income Tax Balances (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred income tax liabilities:
Plant, equipment and intangibles	$ (89,433)	$ (62,987)
Deferred income tax assets:
Postretirement, pensions, and stock compensation	44,814	38,711
Reserves and accruals	22,042	17,878
Net operating loss and tax credit carryforwards	84,716	60,758
Valuation allowances	(7,498)	(23,663)
Deferred tax assets	144,074	93,684
Net deferred income tax asset	$ 54,641	$ 30,697

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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