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Income Taxes - Components of Deferred Income Tax Balances (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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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

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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