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Long-term debt - Kronos Term Loan - Additional Information (Detail) | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2012 LIBOR Option [Member] | Dec. 31, 2012 Base Rate Option [Member] | Dec. 31, 2012 Kronos Worldwide, Inc. [Member] USD ($) | Dec. 31, 2012 Kronos Worldwide, Inc. [Member] Scenario, Forecast [Member] USD ($) | Jun. 30, 2012 Kronos Worldwide, Inc. [Member] 6.5% Senior Secured Notes [Member] EUR (€) | Dec. 31, 2012 Kronos Worldwide, Inc. [Member] Term Loan Payable [Member] USD ($) | Sep. 30, 2012 Kronos Worldwide, Inc. [Member] Term Loan Payable [Member] | Dec. 31, 2012 Kronos Worldwide, Inc. [Member] Term Loan Payable [Member] USD ($) | Feb. 28, 2013 Kronos Worldwide, Inc. [Member] Term Loan Payable [Member] USD ($) | Dec. 31, 2012 Kronos Worldwide, Inc. [Member] Term Loan Payable [Member] Certain US Subsidiaries [Member] | Dec. 31, 2012 Kronos Worldwide, Inc. [Member] Term Loan Payable [Member] Canadian Subsidiary [Member] | Dec. 31, 2012 Kronos Worldwide, Inc. [Member] New Loan [Member] USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt instrument |  |  |  |  |  |  | $ 400,000,000 |  | $ 400,000,000 |  |  |  |
Interest rate of Senior Secured Notes |  |  |  | 6.50% |  |  |  |  |  |  |  |  |
Principal amount outstanding |  |  |  |  |  | 279,200,000 |  |  |  |  |  |  |
Percentage of term loan issued |  |  |  |  |  |  | 98.50% |  | 98.50% |  |  |  |
Term Loan |  |  |  |  |  |  | 394,000,000 |  | 394,000,000 |  |  |  |
Additional term loan borrowings |  |  |  |  |  |  | 100,000,000 |  | 100,000,000 |  |  |  |
Minimum LIBOR rate for Kronos Option | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Variable rate for term loan |  | 4.75% | 3.75% |  |  |  |  |  |  |  |  |  |
Average interest rate on revolving bank credit facility |  |  |  |  |  |  | 5.75% |  | 5.82% |  |  |  |
Principal repayments |  |  |  |  |  |  |  | 5.0 | Quarterly |  |  |  |
Principal repayments maturity date |  |  |  | Jun. 30, 2018 |  |  |  |  | Jun. 30, 2018 |  |  |  |
Collateralized loan on common stock |  |  |  |  |  |  |  |  |  |  | 100.00% | 65.00% |
Additional collateral on Kronos Term Loan |  |  |  |  |  |  |  |  | 362,100,000 |  |  |  |
Specified financial covenant (leverage to EBITDA) |  |  |  |  |  |  |  |  | 3.5 |  |  |  |
Provision for other indebtedness |  |  |  |  |  |  | 50,000,000 |  | 50,000,000 |  |  |  |
Carrying amount of term loan includes unamortized original issue discount |  |  |  |  |  |  | 5,500,000 |  | 5,500,000 |  |  |  |
Prepayment of term loan |  |  |  |  |  |  |  |  | 290,000,000 |  |  |  |
Prepayment of loan by cash |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 190,000,000
Term loan |  |  |  | 384,500,000 |  |  |  |  |  | 100,000,000 |  |  |
Expected non cash pretax interest |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |

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- Definition The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -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 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 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
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