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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Components Of Deferred Tax Assets And Liabilities [Abstract] |  |
Accrued liabilities and reserves | $ 171,998 | $ 146,658
Allowance for doubtful accounts | 16,434 | 18,479
Inventory | 62,755 | 79,363
Post-retirement benefits | 12,714 | 10,288
Commodity hedges | 4,033 | 5,164
Net operating loss carryforward | 63,952 | 59,083
Tax credit carryforwards | 187,267 | 164,132
Other deferred tax assets | 10,674 | 8,508
Valuation allowance | (207,653) | (192,295)
Total deferred tax assets | 322,174 | 299,380
Holdbacks and amounts not due under contracts | (14,051) | (12,930)
Intangibles | (177,061) | (171,531)
Property, plant and equipment | (680,688) | (545,890)
Book/Tax differences on debt modifications | (46,813) |
Total deferred tax liabilities | (918,613) | (730,351)
Total net deferred tax liabilities | $ (596,439) | $ (430,971)

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