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Organization and Basis of Presentation - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2019
Valhi Inc | Kronos Worldwide, Inc. |
Organization And Basis Of Presentation [Line Items] |
Ownership percentage in subsidiary | 50.00%
Valhi Inc | NL Industries Inc. |
Organization And Basis Of Presentation [Line Items] |
Ownership percentage in company | 83.00%
NL Industries Inc. | Kronos Worldwide, Inc. |
Organization And Basis Of Presentation [Line Items] |
Ownership percentage | 30.00%
Contran |
Organization And Basis Of Presentation [Line Items] |
Controlling interest description | Consequently, at June 30, 2019, Ms. Simmons and Ms. Connelly may be deemed to control Contran, Valhi, NL and us
Contran | Valhi Inc |
Organization And Basis Of Presentation [Line Items] |
Ownership percentage of parent company held by related party | 92.00%

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- Details
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