Equity - Additional Information (Detail) - Kronos Worldwide, Inc. $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) shares
Equity Class Of Treasury Stock [Line Items]
Common stock, Repurchased	264,992
Stock repurchase, aggregate purchase price | $	$ 3.0
Shares available for purchase	1,700,000
Common stock , shares cancelled	110,303
Common stock, cancelled | $	$ 1.4