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Stockholders' Equity - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Jun. 30, 2013 $ / shares	Mar. 31, 2013 $ / shares	Dec. 31, 2015 Vote shares	Dec. 31, 2014 shares	Dec. 31, 2013 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Treasury stock purchases			0	0	0
Shares available for purchase			678,000
Common Stock Dividend declared by directors | $ / shares	$ 0.05	$ 0.125
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
Shares available for award			181,000
Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, vote per share | Vote			1
Class B Common Stock | NL Industries
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, vote per share | Vote			1
Common stock, vote per share | Vote			10

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Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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