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Stockholder's Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments of dividends |  |  |  |  |  |  |  |  | $ 11,700 | $ 7,800 | $ 0
Quarterly dividends paid (in dollars per share) | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.04 |  |  |
NL |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock awarded to board of directors |  |  |  |  |  |  |  |  | 13,750 | 33,250 | 28,250
Shares available for award | 66,150 |  |  |  |  |  |  |  | 66,150 |  |
NL | Maximum |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate of common stock awarded to directors |  |  |  |  |  |  |  |  | 200,000 |  |
CompX |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares available for award | 136,450 |  |  |  |  |  |  |  | 136,450 |  |
CompX | Maximum |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate of common stock awarded to directors |  |  |  |  |  |  |  |  | 200,000 |  |
Kronos |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares available for award | 120,200 |  |  |  |  |  |  |  | 120,200 |  |
Kronos | Maximum |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate of common stock awarded to directors |  |  |  |  |  |  |  |  | 200,000 |  |

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