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Long-term debt - Kronos Term Loan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  | 1 Months Ended | 3 Months Ended | 1 Months Ended |
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Mar. 31, 2013 | Mar. 31, 2013 Kronos Worldwide, Inc. [Member] | Dec. 31, 2012 Kronos Worldwide, Inc. [Member] | Feb. 28, 2013 Kronos Worldwide, Inc. [Member] Contran [Member] | Mar. 31, 2013 Kronos Worldwide, Inc. [Member] Contran [Member] | Mar. 31, 2013 Kronos Worldwide, Inc. [Member] Term Loan [Member] | Feb. 28, 2013 Kronos Worldwide, Inc. [Member] Term Loan [Member] Principal Prepayment [Member] | Feb. 28, 2013 Kronos Worldwide, Inc. [Member] Term Loan [Member] Outstanding Balance Including Unamortized Discount [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Payment of Principal Amount |  |  |  |  |  |  | $ 290 |
Pre Tax Interest Charge | (6.6) |  |  |  |  |  | 6.6 |
Cash used for payment of term loan |  |  |  |  |  |  | 100 |
Borrowing from Contran for prepayment of term loan |  |  |  |  |  |  | 190 |
Term loan maturity date |  |  |  | Jun. 30, 2018 |  |  |  |
Principal amount outstanding |  | 98.6 | 384.5 |  |  |  |  | 100.0
Percentage of average interest rate |  |  |  |  | 7.375% | 7.00% |  |
Percentage of average interest rate, during period |  |  |  |  | 7.375% | 6.60% |  |
Unamortized Discount |  | $ 1.4 |  |  |  |  |  |

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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Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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