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Investment in Kronos Worldwide, Inc. - Selected Financial Information of Kronos Income Statement (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items] |  |  |
Net sales | $ 140,815 | $ 114,537 | $ 124,243
Cost of sales | 98,066 | 81,689 | 85,280
Income from operations | 10,491 | 2,357 | (1,609)
Income tax expense | 7,479 | (2,515) | 579
Net income | 51,188 | 14,680 | 25,844
Kronos | Reportable Legal Entities |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Net sales | 1,939,400 | 1,638,800 | 1,731,100
Cost of sales | 1,493,200 | 1,287,600 | 1,344,900
Income from operations | 187,100 | 116,200 | 145,800
Income tax expense | 40,500 | 16,100 | 34,000
Net income | $ 112,900 | $ 63,900 | $ 87,100

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