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Financial Instruments - Additional Information (Detail) - Kronos Worldwide, Inc.	1 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2015 USD ($)
3.75% Senior Secured Notes due September 15, 2025 | Kronos International, Inc
Financial Instrument At Fair Value [Line Items]
Estimated market price of the notes | €				€ 1,020
Principal amount of debt instrument | €				€ 1,000
Currency Forward Contracts
Financial Instrument At Fair Value [Line Items]
Currency forward contracts outstanding		$ 0			$ 0
Interest Rate Swap | Libor Rate
Financial Instrument At Fair Value [Line Items]
Derivative, type of instrument		pay-fixed/receive-variable interest rate swap
Interest rate swap, type of interest rate		fixed
Interest rate swap, fixed rate		2.016%		2.016%
Interest rate swap, floor rate		1.00%		1.00%
Interest rate swap, inception date		Aug. 31, 2015
Interest rate swap, effective date		Sep. 30, 2015
Notional amount currency forward contract						$ 344,800,000
Interest rate swap, notional amount decline each quarter		$ 875,000
Interest rate swap, notional amount decline commencing date		Dec. 31, 2015
Derivative maturity date		Feb. 29, 2020
Termination of interest rate swap contract paid	$ 3,300,000
Pretax unrealized loss recognized in other comprehensive income (loss) related to interest rate swap contract			$ 2,300,000
Interest rate swap, gains or losses representing hedge ineffectiveness			0
Interest Rate Swap | Libor Rate | Interest Expense
Financial Instrument At Fair Value [Line Items]
Reclassified from accumulated other comprehensive loss in to earnings			$ 2,100,000

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