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Income Taxes - Components of Deferred Income Tax Balances (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Income Tax Disclosure [Abstract] |  |
Plant, equipment, and intangibles | $ (203,736) | $ (90,413)
Deferred income tax assets: |  |
Postretirement, pensions, and stock compensation | 32,831 | 34,656
Reserves and accruals | 44,345 | 44,809
Net operating loss and tax credit carryforwards | 231,892 | 217,902
Valuation allowances | (117,071) | (157,317)
Deferred tax assets | 191,997 | 140,050
Deferred income tax liabilities: |  |
Net deferred income tax asset |  | $ 49,637
Net deferred income tax liability | $ (11,739) |

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