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Marketable Securities - Classification of Marketable Securities (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022
Marketable Securities [Line Items] |  |
Market value | $ 4.2 | $ 3.2
Cost basis | 3.3 |
Unrealized gain (loss) | 0.9 |
Level 1 | Common stock | Valhi |  |
Marketable Securities [Line Items] |  |
Market value | 4.1 | 3.2
Cost basis | 3.2 | $ 3.2
Unrealized gain (loss) | 0.9 |
Level 1 | Common stock | NL And CompX |  |
Marketable Securities [Line Items] |  |
Market value | 0.1 |
Cost basis | $ 0.1 |

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- Definition Amount of unrealized gain (loss) on investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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