Income Taxes - Additional Information (Detail) In Millions, unless otherwise specified		6 Months Ended
Jun. 30, 2013 USD ($)	Jun. 30, 2013 Proposed adjustment to certain foreign tax liabilities USD ($)	Jun. 30, 2013 Kronos Worldwide, Inc. Bank Of Montreal CAD
Income Taxes Disclosure [Line Items]
Letter of credit collateralized			7.5
Potential cash tax liability full amount for the proposed adjustment		15.6
Unrecognized tax benefits	$ 4.4

The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 21

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant