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Business Segment Information - Additional Information (Detail) - Jun. 30, 2015 - USD ($) $ in Millions | Total
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Chemicals |
Segment Reporting Information [Line Items] |
Restructuring charges | $ 21.1
Kronos Worldwide, Inc. |
Segment Reporting Information [Line Items] |
Direct controlling interest in subsidiary | 50.00%
Indirect controlling interest in subsidiary | 30.00%
NL |
Segment Reporting Information [Line Items] |
Total controlling interest | 83.00%
LandWell |
Segment Reporting Information [Line Items] |
Direct controlling interest in subsidiary | 27.00%
Indirect controlling interest in subsidiary | 50.00%
BMI |
Segment Reporting Information [Line Items] |
Total controlling interest | 63.00%

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