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Organization and Basis of Presentation - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2021
Valhi Inc | Parent Company |
Organization And Basis Of Presentation [Line Items] |
Parent company ownership interest | 50.00%
Valhi Inc | NL Industries Inc. |
Organization And Basis Of Presentation [Line Items] |
Ownership percentage in company | 83.00%
NL Industries Inc. | Parent Company |
Organization And Basis Of Presentation [Line Items] |
Parent company ownership interest | 30.00%
Contran |
Organization And Basis Of Presentation [Line Items] |
Controlling interest description | Consequently, at September 30, 2021 Ms. Simmons and the Family Trust may be deemed to control Contran, and therefore may be deemed to indirectly control the wholly-owned subsidiary of 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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