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Stockholders' Equity - Additional Information (Detail) |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 17, 2018 Vote shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2017 $ / shares shares | Dec. 31, 2016 $ / shares shares | Dec. 31, 2014 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock, shares authorized | 20,000,000 |  |  |  |
Preferred stock, shares authorized | 1,000 | 1,000 | 1,000 |  |
Treasury stock purchases |  | 0 | 0 | 0 |
Shares available for purchase |  | 678,000 |  |  |
Common Stock Dividend declared by directors | $ / shares |  | $ 0.05 | $ 0.05 | $ 0.05 |
2013 Director Stock Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares available for award |  | 156,550 |  |  |
Non-Employee | 2013 Director Stock Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock shares authorized to be issued under the plan |  | 200,000 |  |  |
Class B Common Stock |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock, vote per share | Vote | 10 |  |  |  |
Common stock, vote per share | Vote | 1 |  |  |  |
Common stock, shares issued |  |  | 10,000,000 |  |
Common stock, shares outstanding |  |  | 10,000,000 | 10,000,000 | 10,000,000
Common stock, shares authorized |  |  | 10,000,000 |  |
Class A Common Stock |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock, vote per share | Vote | 1 |  |  |  |
Common stock, shares issued |  | 12,435,557 | 2,426,107 |  |
Common stock, shares outstanding |  | 12,435,557 | 2,426,107 | 2,419,107 | 2,411,107
Common stock, shares authorized |  | 20,000,000 | 20,000,000 |  |
NL Industries |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Conversion of common stock | 10,000,000 |  |  |  |
NL Industries | Class B Common Stock |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock, shares issued | 10,000,000 |  |  |  |
Common stock, shares outstanding | 10,000,000 |  |  |  |

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