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Long-term debt - Revolving Credit Facility - Additional Information (Detail) (Kronos Worldwide, Inc. [Member]) In Millions, unless otherwise specified |  |  |  | 3 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Mar. 31, 2013 Canada [Member] USD ($) | Mar. 31, 2013 Canada [Member] CAD | Mar. 31, 2013 Revolving North American Credit Facility [Member] USD ($) | Mar. 31, 2013 Bank Of Montreal [Member] CAD | Mar. 31, 2013 European Line of Credit [Member] USD ($) | Mar. 31, 2013 Economic development agency credit facility [Member] USD ($) | Mar. 31, 2013 Economic development agency credit facility [Member] CAD
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Percentage of average interest rate |  |  |  |  |  |  | 2.03% |  |
Outstanding borrowings under this credit facility | $ 12.8 | $ 13.2 |  |  | $ 0 |  | $ 0 |  |
Percentage of average interest rate, during period |  |  |  |  |  |  | 2.01% |  |
Amount available for Borrowing |  |  |  |  | 125.0 |  | 140.5 |  |
Revolving credit facility, borrowings |  |  |  |  | 0 |  |  |  |
Repayments of Lines of Credit |  |  |  |  | 0 |  |  |  |
Aggregate letter of credit outstanding amount |  |  |  |  |  | 7.5 |  |  |
Issuance of letter of credit |  |  |  |  |  | 10.0 |  |  |
Outstanding borrowings under this credit facility |  |  | 1.8 | 1.8 |  |  |  |  |
Imputed interest on borrowings |  |  |  |  |  |  |  | $ 0.5 | 0.5

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The cash outflow to pay off an obligation from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -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. + Details
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