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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2019
Investments Debt And Equity Securities [Abstract] |
Schedule of Marketable Securities |
|  | Fair value |  |  |  |  |  |  |  |  |  |  |  |
|  | measurement |  | Market |  |  | Cost |  |  | Unrealized |
|  | level |  | value |  |  | basis |  |  | gain |
|  |  |  | (In thousands) |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valhi common stock |  | 1 |  | $ | 27,740 |  |  | $ | 24,347 |  |  | $ | 3,393 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valhi common stock |  | 1 |  | $ | 26,877 |  |  | $ | 24,347 |  |  | $ | 2,530 |

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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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