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Organization and Basis of Presentation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2016
Valhi Inc
Organization And Basis Of Presentation [Line Items]
Ownership percentage in subsidiary	50.00%
Ownership percentage in company	83.00%
NL Industries Inc.
Organization And Basis Of Presentation [Line Items]
Ownership percentage	30.00%
Contran
Organization And Basis Of Presentation [Line Items]
Ownership percentage of parent company held by related party	93.00%

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- Definition

Organization and basis of presentation.

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Percentage of related party's outstanding common stock owned by parent company.

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Percentage of outstanding common stock owned by related party.

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Percentage of parent company's common stock held by private parent company and its subsidiaries.

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