Organization and basis of presentation (Details) |
Jun. 30, 2026 |
|---|---|
| NL Industries | CompX International Inc | |
| Organization and basis of presentation | |
| Percentage of ownership held by parent company | 87.00% |
| Valhi Inc | NL Industries | |
| Organization and basis of presentation | |
| Percentage of ownership held by parent company | 83.00% |
| Contran Corporation | Valhi Inc | |
| Organization and basis of presentation | |
| Percentage of ownership held by parent company | 91.00% |