Long-Term Debt - Kronos Senior Secured Notes - Additional Information (Detail) - Kronos Worldwide, Inc. - 3.75% Senior Secured Notes due September 15, 2025 - Kronos International, Inc € in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2023 EUR (€)	Sep. 30, 2023 USD ($)
Debt Instrument [Line Items]
Debt instrument interest rate	3.75%	3.75%
Debt instrument maturity date	Sep. 15, 2025
Debt instrument principal amount | €	€ 400
Unamortized debt issuance costs | $		$ 1.7