Organization and Basis of Presentation - Additional Information (Detail) - ThirdParty	Jul. 16, 2019	Jun. 30, 2019
Kronos
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest		30.00%
Successor | Subsequent Event
Organization And Basis Of Presentation [Line Items]
Number of third parties co-trustees	2
Parent Company | Valhi Inc
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest		83.00%
Parent Company | Contran Corporation
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest		92.00%