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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

Equity securities Fv-Ni accumulated gross unrealized loss.

+ References

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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

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- Definition

Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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