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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2021
Investments Debt And Equity Securities [Abstract] |
Schedule of Marketable Securities |
| Fair value measurement level |  | Market value |  |  | Cost basis |  |  | Unrealized gain (loss) |
|  |  | (In thousands) |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Valhi common stock | 1 |  | $ | 18,206 |  |  | $ | 24,347 |  |  | $ | (6,141 | )
June 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Valhi common stock | 1 |  | $ | 29,141 |  |  | $ | 24,347 |  |  | $ | 4,794 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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