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Business segment information - Holding Percentage of Subsidiaries (Detail) | Mar. 31, 2013
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Kronos Worldwide, Inc. [Member] |
Segment Reporting Information [Line Items] |
Controlling interest in business segments | 80.00%
CompX [Member] |
Segment Reporting Information [Line Items] |
Controlling interest in business segments | 87.00%
WCS [Member] |
Segment Reporting Information [Line Items] |
Controlling interest in business segments | 100.00%

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration