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Summary of significant accounting policies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Organization And Basis Of Presentation [Line Items] |  |  |  |
Capitalized interest costs |  | $ 1.5 | $ 1.2 | $ 1.1
Income taxes paid, net |  | 17.3 | 37.3 | 41.6
Cost of sales |  | 1,501.6 | 1,539.1 | 1,493.2
Research and development costs |  | 18.0 | 15.0 | 17.0
Fixed asset impairment | $ 3.8 |  |  |
Shipping and Handling |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Cost of sales |  | $ 101.0 | 122.0 | 132.0
Louisiana pigment company, L.P |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Owned manufacturing joint venture | 50.00% | 50.00% |  |
Valhi Inc |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Income taxes paid, net |  | $ 11.8 | $ 15.9 | $ 17.6
Valhi Inc | Parent Company |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Parent company ownership interest | 50.00% | 50.00% |  |
Valhi Inc | NL Industries Inc. |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Ownership percentage in company | 83.00% | 83.00% |  |
NL Industries Inc. | Parent Company |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Parent company ownership interest | 31.00% | 31.00% |  |
Contran |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |
Controlling interest description |  | Consequently, at December 31, 2023, 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 | 91.00% | 91.00% |  |

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