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Stockholders' Equity - Additional Information (Detail)		12 Months Ended
	Jul. 17, 2018 Vote shares	Dec. 31, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 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		$ 0.07	$ 0.05	$ 0.05
2013 Director Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for award		149,050
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 outstanding				10,000,000	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		12,443,057	12,435,557
Common stock, shares outstanding		12,443,057	12,435,557	2,426,107	2,419,107
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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