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Marketable Securities - Additional Information (Detail) - Valhi Inc - Common stock - $ / shares shares in Millions	Jun. 30, 2019	Dec. 31, 2018
Marketable Securities [Line Items]
Investments in publicly-traded shares	1.7	1.7
Quoted market price of per share	$ 2.97	$ 1.93

X

- Definition

Balance held at close of period in number of shares.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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