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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
Aug. 10, 2020 | Mar. 31, 2021
Class A | CompX |  |
Schedule Of Stockholders Equity [Line Items] |  |
Common stock, Repurchased |  | 50,000
Stock repurchase, aggregate purchase price |  | $ 0.8
Shares available for purchase |  | 600,000
Contran |  |
Schedule Of Stockholders Equity [Line Items] |  |
Non-cumulative dividend on preferred stock | 6.00% |
Preferred stock returned to contribution agreement authorized designated | 5,000 |
Preferred stock, par value | $ 0.01 |
Contran | Series A Preferred Stock |  |
Schedule Of Stockholders Equity [Line Items] |  |
Non-cumulative dividend on preferred stock | 6.00% |
Preferred stock, shares outstanding | 5,000 |

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