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Long-term debt - Revolving Credit Facility - Additional Information (Detail) (Kronos Worldwide, Inc. [Member]) | 12 Months Ended |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 North American Line of Credit [Member] USD ($) | Dec. 31, 2012 North American Line of Credit [Member] CAD | Jun. 30, 2012 North American Line of Credit [Member] USD ($) | Dec. 31, 2012 North American Line of Credit [Member] LIBOR Option [Member] | Dec. 31, 2012 North American Line of Credit [Member] Base Rate Option [Member] | Dec. 31, 2012 European Line of Credit [Member] USD ($) | Dec. 31, 2012 European Line of Credit [Member] EUR (€) | Dec. 31, 2012 Canadian Letter Of Credit Loan Agreement [Member] USD ($) | Dec. 31, 2012 Canadian Letter Of Credit Loan Agreement [Member] CAD | Dec. 31, 2011 Canadian Letter Of Credit Loan Agreement [Member] CAD | Dec. 31, 2012 Canadian Loan Agreement [Member] CAD
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Borrowing availability |  | 25,000,000 | $ 125,000,000 |  |  |  | € 120,000,000 |  |  |  |
Credit facility maturity date | June 2017. |  |  |  |  |  |  |  |  |  |
Availability of letters of credit | 15,000,000 |  |  |  |  |  |  |  | 7,500,000 |  |
Variable rate for revolving credit facility, Minimum |  |  |  | 1.50% | 0.50% |  |  |  |  |  |
Variable rate for revolving credit facility, Maximum |  |  |  | 2.00% | 1.00% |  |  |  |  |  |
Fixed charge coverage ratio, minimum value | 1.0 |  |  |  |  |  |  |  |  |  |
Amount available for borrowing | 125,000,000 |  |  |  |  | 144,900,000 |  |  |  |  |
Credit facility borrowed and repaid | 71,000,000 |  |  |  |  |  |  |  |  |  |
Average interest rate | 3.75% |  |  |  |  | 2.01% | 2.01% |  |  |  |
Debt instrument basis spread on variable rate |  |  |  |  |  | 1.90% | 1.90% |  |  |  |
Borrowings under credit facility |  |  |  |  |  | 107,400,000 | 80,000,000 |  |  |  |
Average interest rate on revolving bank credit facility |  |  |  |  |  | 1.88% | 1.88% |  |  |  |
Credit facility repaid an aggregate |  |  |  |  |  | 88,600,000 | 70,000,000 |  |  |  |
Principal amount of debt instrument |  |  |  |  |  |  |  |  |  | 10,000,000 | 7,100,000
Restricted Deposits |  |  |  |  |  |  |  | 7,500,000 |  |  |
Additional indebtedness |  |  |  |  |  |  |  |  | 35,000,000 |  |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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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- Definition Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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. + Details
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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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