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Marketable Securities - Classification of Marketable Securities (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Marketable Securities [Line Items] |  |
Market value | $ 2.0 | $ 3.3
Cost basis | 3.3 | 3.3
Unrealized loss | (1.3) |
Level 1 | Common stock | Valhi |  |
Marketable Securities [Line Items] |  |
Market value | 1.9 | 3.2
Cost basis | 3.2 | 3.2
Unrealized loss | (1.3) |
Level 1 | Common stock | NL And CompX |  |
Marketable Securities [Line Items] |  |
Market value | 0.1 | 0.1
Cost basis | $ 0.1 | $ 0.1

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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