The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-SubTopic 10
-Section S99
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Business combinations discontinued operations and related transactions.

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Business Combinations, Dispositions and Related Transactions - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
	Nov. 18, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Kronos Worldwide, Inc.
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Repurchase of common stock					2,000,000
Repurchased shares		0	0	0
Shares available for purchase		1,950,000
CompX \| Class A
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Shares available for purchase		678,000
WCS \| Divestiture Terms Pending
Business Combinations Discontinued Operations And Related Transactions [Line Items]
Proceeds from sale of subsidiary	$ 270