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Related Party Transactions - Additional Information (Detail) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Contran \| Intercorporate Services Agreements Fees
Related Party Transaction [Line Items]
Related party transaction		$ 35,800,000	$ 33,400,000	$ 36,100,000
Contran \| Intercorporate Services Agreements Fees \| Scenario, Forecast
Related Party Transaction [Line Items]
Related party transaction	$ 36,500,000
Contran \| Combined Information Technology Data Recovery Program
Related Party Transaction [Line Items]
Related party transaction		298,000	243,000	186,000
Contran \| Pledge Fee Received
Related Party Transaction [Line Items]
Revenue and other income from related party transactions		800,000	$ 900,000	800,000
Contran \| Tremont \| Deferred Payment \| Present Value
Related Party Transaction [Line Items]
Guarantee Obligations, estimated exposure		8,800,000
Contran \| Tremont \| Deferred Payment \| Face Value
Related Party Transaction [Line Items]
Guarantee Obligations, estimated exposure		11,100,000
Contran \| Tremont \| Promissory Notes
Related Party Transaction [Line Items]
Guarantee Obligations, estimated exposure		$ 17,100,000
Contran \| Kronos Worldwide, Inc. \| Securities Pledged as Collateral
Related Party Transaction [Line Items]
Stock pledged as collateral		31.2	12.0
Contran \| WCS \| Surety Bond
Related Party Transaction [Line Items]
Guarantee Obligations, maximum exposure					$ 87,900,000
Contran \| WCS \| Performance Guarantee
Related Party Transaction [Line Items]
Guarantee Obligations, estimated exposure		$ 3,900,000	$ 3,900,000	3,900,000
Contran \| Revolving Credit Facility
Related Party Transaction [Line Items]
Interest on borrowings under credit facilities		10,300,000	11,000,000	19,000,000
Contran \| Letter Of Credit \| WCS
Related Party Transaction [Line Items]
Guarantee Obligations, maximum exposure		6,100,000
Costs related to the Letter of Credit		100,000	100,000	100,000
Contran and Other Affiliates
Related Party Transaction [Line Items]
Related party transaction cash received for insurance premium		5,400,000	5,700,000	5,700,000
LPC
Related Party Transaction [Line Items]
Purchase of Ti02 from LPC		176,500,000	193,100,000	224,500,000
Sales of feedstock ore to LPC		$ 80,600,000	$ 98,400,000	$ 141,100,000