Marketable Securities - Additional Information (Detail) - Common stock - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Jun. 30, 2022	Dec. 31, 2021
NL And CompX
Marketable Securities [Line Items]
Sale of NL and CompX common stock	$ 0.1
Valhi Inc
Marketable Securities [Line Items]
Investments in publicly-traded shares	144,000	144,000
Quoted market price of per share	$ 45.34	$ 28.75

Balance held at close of period in number of shares.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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