Long-Term Debt - Revolving Credit Facility - Additional Information (Detail) (Kronos Worldwide, Inc.) In Millions, unless otherwise specified	3 Months Ended		3 Months Ended
	Mar. 31, 2014 European Credit Facility EUR (€)	Mar. 31, 2014 European Credit Facility USD ($)	Mar. 31, 2014 Revolving North American credit facility USD ($)	Mar. 31, 2014 Bank Of Montreal CAD	Mar. 31, 2014 Economic Development Agency Credit Facility Canada USD ($)	Mar. 31, 2014 Economic Development Agency Credit Facility Canada CAD
Line Of Credit Facility [Line Items]
Revolving credit facility, borrowings	€ 0		$ 81.0
Repayment of credit facility	0		92.1
Outstanding borrowings under revolving credit facility	0				1.6	1.8
Amount available for borrowing	90.0	123.4	107.0
Percentage of borrowings available under credit facility		75.00%
Percentage of average interest rate, during period			3.75%
Aggregate letter of credit outstanding amount				7.9
Issuance of letter of credit				10.0