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Income Taxes - Components of Net Deferred Tax Liability (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Tax effect of temporary differences related to: |  |
Inventories | $ 400 | $ 400
Accrued OPEB costs | 300 | 400
Accrued pension costs | 700 | 1,700
Accrued employee benefits | 1,200 | 1,100
Accrued environmental liabilities | 31,700 | 33,600
Other accrued liabilities and deductible differences | 200 | 300
Tax loss and credit carryforwards |  | 1,200
Adjusted gross deferred tax assets (liabilities) | 34,500 | 38,700
Netting of items by tax jurisdiction | (34,500) | (38,700)
Marketable securities | (5,400) | (5,600)
Property and equipment | (2,800) | (2,600)
Goodwill | (1,700) | (1,700)
Other taxable differences | (2,300) | (2,400)
Investment in Kronos Worldwide, Inc. | (56,300) | (57,800)
Adjusted gross deferred tax assets (liabilities) | (68,500) | (70,100)
Netting of items by tax jurisdiction | 34,500 | 38,700
Net noncurrent deferred tax asset (liability) | $ (33,957) | $ (31,373)

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