Organization and Basis of Presentation - Additional Information (Detail)	Sep. 30, 2015
Kronos
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest	30.00%
Valhi Inc
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest	83.00%
Contran Corporation
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest	93.00%
Minimum ownership required to designate board member	5.00%