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Fair Value Measurements and Financial Instruments - Additional Information (Detail) € in Millions	6 Months Ended
	Jun. 30, 2016 USD ($) NOK / € NOK / $ CAD / $ € / $	Jun. 30, 2016 EUR (€) NOK / € NOK / $ CAD / $ € / $	Dec. 31, 2015 USD ($)
Financial Instrument At Fair Value [Line Items]
Estimated fair value of currency forward contracts			$ (1,200,000)
Fair value of interest rate swap contract, current and noncurrent	$ 9,200,000		3,500,000
Marketable securities	256,300,000		254,900,000
Accounts and other receivables
Financial Instrument At Fair Value [Line Items]
Estimated fair value of currency forward contracts	200,000
Accounts payable and accrued liabilities
Financial Instrument At Fair Value [Line Items]
Estimated fair value of currency forward contracts	200,000
Interest Rate Swap
Financial Instrument At Fair Value [Line Items]
Fair value of interest rate swap contract, current	3,400,000		3,300,000
Fair value of interest rate swap contract, noncurrent	5,800,000		200,000
Kronos Worldwide, Inc. \| 2014 Term Loan
Financial Instrument At Fair Value [Line Items]
Estimated market price of the notes	932.0		900
Principal amount of debt instrument	1,000		1,000
Kronos Worldwide, Inc. \| Interest Rate Swap \| Libor Rate
Financial Instrument At Fair Value [Line Items]
Notional amount currency forward contract	$ 342,000,000		$ 344,750,000
Derivative maturity date	Feb. 29, 2020
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. 07, 2015
Interest rate swap, effective date	Sep. 30, 2015
Interest rate swap, notional amount decline each quarter	$ 875,000
Interest rate swap, notional amount decline commencing date	Dec. 31, 2015
Interest rate swap, gains or losses representing hedge ineffectiveness	$ 0
Pretax loss amount recognized in other comprehensive income (loss) related to interest rate swap contract	5,700,000
Reclassified from accumulated other comprehensive income (loss) in to interest expense	1,800,000
Accumulated other comprehensive income (loss) expected to be reclassified to interest expense in next twelve months	3,500,000
Fair value of interest rate swap contract, current and noncurrent	9,200,000
Kronos Worldwide, Inc. \| Interest Rate Swap \| Accounts payable and accrued liabilities \| Libor Rate
Financial Instrument At Fair Value [Line Items]
Fair value of interest rate swap contract, current	3,400,000
Kronos Worldwide, Inc. \| Interest Rate Swap \| Other Noncurrent Liabilities \| Libor Rate
Financial Instrument At Fair Value [Line Items]
Fair value of interest rate swap contract, noncurrent	5,800,000
Kronos Worldwide, Inc. \| Forward Contracts
Financial Instrument At Fair Value [Line Items]
Currency transaction gain, net	1,100,000
Kronos Worldwide, Inc. \| Forward Contracts \| Euro
Financial Instrument At Fair Value [Line Items]
Notional amount currency forward contract	7,500,000
Maturity rate of derivative	1,300,000
Kronos Worldwide, Inc. \| Norwegian Kroner \| Forward Contracts
Financial Instrument At Fair Value [Line Items]
Notional amount currency forward contract	12,900,000
Maturity rate of derivative	2,200,000
Kronos Worldwide, Inc. \| Norwegian Kroner \| Forward Contracts \| Euro
Financial Instrument At Fair Value [Line Items]
Notional amount currency forward contract \| €		€ 17.9
Maturity rate of derivative \| €		€ 2.9
Kronos Worldwide, Inc. \| Canadian \| Forward Contracts
Financial Instrument At Fair Value [Line Items]
Notional amount currency forward contract	$ 15,500,000
Exchange rate \| CAD / $	1.29	1.29
Kronos Worldwide, Inc. \| Canadian \| Forward Contracts \| July 2016
Financial Instrument At Fair Value [Line Items]
Maturity rate of derivative	$ 3,100,000
Kronos Worldwide, Inc. \| Canadian \| Forward Contracts \| August 2016 through December 2016
Financial Instrument At Fair Value [Line Items]
Maturity rate of derivative	2,500,000
Amalgamated Sugar Company LLC
Financial Instrument At Fair Value [Line Items]
Marketable securities	$ 250,000,000
Minimum \| Kronos Worldwide, Inc. \| Forward Contracts \| Euro
Financial Instrument At Fair Value [Line Items]
Exchange rate \| € / $	1.13	1.13
Derivative maturity date	Jul. 31, 2016
Minimum \| Kronos Worldwide, Inc. \| Norwegian Kroner \| Forward Contracts
Financial Instrument At Fair Value [Line Items]
Exchange rate \| NOK / $	8.31	8.31
Derivative maturity date	Jul. 31, 2016
Minimum \| Kronos Worldwide, Inc. \| Norwegian Kroner \| Forward Contracts \| Euro
Financial Instrument At Fair Value [Line Items]
Exchange rate \| NOK / €	9.42	9.42
Derivative maturity date	Jul. 31, 2016
Minimum \| Kronos Worldwide, Inc. \| Canadian \| Forward Contracts \| July 2016
Financial Instrument At Fair Value [Line Items]
Derivative maturity date	Jul. 31, 2016
Maximum \| Kronos Worldwide, Inc. \| Forward Contracts \| Euro
Financial Instrument At Fair Value [Line Items]
Exchange rate \| € / $	1.14	1.14
Derivative maturity date	Dec. 31, 2016
Maximum \| Kronos Worldwide, Inc. \| Norwegian Kroner \| Forward Contracts
Financial Instrument At Fair Value [Line Items]
Exchange rate \| NOK / $	8.33	8.33
Derivative maturity date	Dec. 31, 2016
Maximum \| Kronos Worldwide, Inc. \| Norwegian Kroner \| Forward Contracts \| Euro
Financial Instrument At Fair Value [Line Items]
Exchange rate \| NOK / €	9.47	9.47
Derivative maturity date	Dec. 31, 2016
Maximum \| Kronos Worldwide, Inc. \| Canadian \| Forward Contracts \| August 2016 through December 2016
Financial Instrument At Fair Value [Line Items]
Derivative maturity date	Dec. 31, 2016