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INCOME TAXES - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Pension and other postretirement liabilities | $ 30,517 | $ 22,632
Rationalization and other accrued liabilities | 30,105 | 23,038
AMT and other credit carryforwards | 2,885 | 3,802
Net operating loss carryforwards | 49,882 | 34,792
Other intangible assets | 2,464 | 5,251
Foreign currency translation | 281 | 246
Inventory and related reserves | 21,584 | 26,677
Long term operating lease liabilities | 54,218 | 48,889
Other | 7,135 | 5,265
Total deferred tax assets | 199,071 | 170,592
Deferred tax liabilities: |  |
Property, plant and equipment | (233,109) | (195,039)
Pension and other postretirement liabilities | (24,316) | (25,016)
Other intangible assets | (187,269) | (112,680)
Operating lease right of use assets | (51,902) | (46,709)
Other | (8,770) | (6,258)
Total deferred tax liabilities | (505,366) | (385,702)
Valuation allowance | (20,624) | (15,025)
Net deferred tax liabilities | $ (326,919) | $ (230,135)

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