Long-Term Debt - Kronos Term Loans - Additional Information (Detail) - Kronos Worldwide, Inc. - Kronos International, Inc - 3.75% Senior Secured Notes due September 15, 2025 € in Millions, $ in Millions		12 Months Ended
	Sep. 13, 2017 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 13, 2017 EUR (€)	Sep. 13, 2017 USD ($)
Debt Instrument [Line Items]
Debt instrument principal amount				€ 400	$ 477.6
Debt instrument maturity date	Sep. 15, 2025
Debt instrument interest rate				3.75%	3.75%
Debt instrument, interest payment terms		bear interest at 3.75% per annum,
Debt instrument, frequency of periodic payment of interest		semi-annually
Debt Instrument, date of first required semi-annual payment	Mar. 15, 2018
Debt instrument redemption price percent if experiences certain specified change of control events	101.00%
Debt instrument, redemption, description		have a maturity date of September 15, 2025. Kronos may redeem the Senior Notes at redemption prices ranging from 102.813% of the principal amount, declining to 100% on or after September 15, 2023. If Kronos experiences certain specified change of control events, it would be required to make an offer to purchase the Senior Notes at 101% of the principal amount. Kronos would also be required to make an offer to purchase a specified portion of the Senior Notes at par value in the event that it generates a certain amount of net proceeds from the sale of assets outside the ordinary course of business, and such net proceeds are not otherwise used for specified purposes within a specified time period
Maximum amount of other indebtedness default before triggering customary default provisions	$ 50.0
Unamortized debt issuance costs		$ 3.5	$ 4.7
Collateral Pledged | Direct Domestic Subsidiary of KII and Guarantors
Debt Instrument [Line Items]
Parent company ownership interest				100.00%	100.00%
Collateral Pledged | Foreign Subsidiary Directly Owned by KII or any Guarantor
Debt Instrument [Line Items]
Parent company ownership interest				65.00%	65.00%
Non-voting Common Stock | Collateral Pledged | Foreign Subsidiary Directly Owned by KII or any Guarantor
Debt Instrument [Line Items]
Parent company ownership interest				100.00%	100.00%
On or After September 15, 2020
Debt Instrument [Line Items]
Debt instrument, redemption price percentage	102.813%
On or After September 15, 2023
Debt Instrument [Line Items]
Debt instrument, redemption price percentage	100.00%