Organization and basis of presentation - Additional Information (Detail) |
6 Months Ended |
|---|---|
Jun. 30, 2026 | |
| Valhi Inc | Parent Company | |
| Organization and basis of presentation | |
| Parent company ownership interest | 50.00% |
| Valhi Inc | NLI | |
| Organization and basis of presentation | |
| Ownership percentage in company | 83.00% |
| NLI | Parent Company | |
| Organization and basis of presentation | |
| Parent company ownership interest | 31.00% |
| Contran | |
| Organization and basis of presentation | |
| Controlling interest description | Consequently, at June 30, 2026, 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, NLI and us. |
| Contran | Valhi Inc | |
| Organization and basis of presentation | |
| Ownership percentage of parent company held by related party | 91.00% |