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Long-term debt - Senior Secured Notes - Additional Information (Detail) | 6 Months Ended | 12 Months Ended |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 9 Months Ended | 12 Months Ended
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Jun. 30, 2012 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2012 Kronos Worldwide, Inc. [Member] | Mar. 31, 2011 6.5% Senior Secured Notes [Member] Kronos Worldwide, Inc. [Member] USD ($) | Mar. 31, 2011 6.5% Senior Secured Notes [Member] Kronos Worldwide, Inc. [Member] EUR (€) | Sep. 30, 2011 6.5% Senior Secured Notes [Member] Kronos Worldwide, Inc. [Member] USD ($) | Sep. 30, 2011 6.5% Senior Secured Notes [Member] Kronos Worldwide, Inc. [Member] EUR (€) | Dec. 31, 2011 6.5% Senior Secured Notes [Member] Kronos Worldwide, Inc. [Member] USD ($) | Dec. 31, 2011 6.5% Senior Secured Notes [Member] Kronos Worldwide, Inc. [Member] EUR (€) | Jun. 13, 2012 6.5% Senior Secured Notes [Member] Kronos Worldwide, Inc. [Member] EUR (€) | Sep. 30, 2011 6.5% Senior Secured Notes [Member] Kronos Worldwide, Inc. [Member] Aggregate Purchase Price [Member] EUR (€) | Dec. 31, 2011 6.5% Senior Secured Notes [Member] Kronos Worldwide, Inc. [Member] Aggregate Purchase Price [Member] EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  | $ 115,700,000 | € 80,000,000 | $ 57,600,000 | € 40,600,000 | $ 57,600,000 | € 40,600,000 |  | € 40,800,000 | € 40,800,000
Principal amount of debt instrument |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |
Interest rate of Senior Secured Notes |  |  |  | 6.50% | 6.50% | 6.50% |  |  |  |  |  |  |
Term loan sufficient to pay principal, call premium |  | 1.01083% |  |  | 102.17% | 102.17% |  |  |  |  |  |  |
Call premium of senior long term notes |  | 6,200,000 | 2,500,000 |  | 2,500,000 |  |  |  |  |  |  |  |
Principal amount outstanding |  |  |  |  |  |  |  |  |  |  | 279,200,000 |  |
Net gain redemption of Senior Notes | 7,200,000 |  |  |  | 3,300,000 |  |  |  | 200,000 |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  | € 40,800,000 |  |  |

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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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 Interest rate stated in the contractual debt agreement. + 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 145 -Paragraph A5 -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 AICPA -Name Accounting Principles Board Opinion (APB) -Number 26 -Paragraph 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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6401765&loc=d3e13305-112630 + Details
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- Definition Premium paid over the face value of the Senior Notes to retire the notes before the contractual maturity. + References No definition available. + Details
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- Definition Call premium percentage. + References No definition available. + Details
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