Business Segment Information - Holding Percentage of Subsidiaries (Detail)	Jun. 30, 2013
Kronos Worldwide, Inc.
Segment Reporting Information [Line Items]
Controlling interest in business segments	80.00%
CompX
Segment Reporting Information [Line Items]
Controlling interest in business segments	87.00%
WCS
Segment Reporting Information [Line Items]
Controlling interest in business segments	100.00%

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant