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Long-term debt - Note Payable to Contran - Additional Information (Detail) (Kronos Worldwide, Inc. [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2013 Term Loan [Member] | Feb. 28, 2013 Term Loan [Member] Principal Prepayment [Member] | Mar. 31, 2013 Contran [Member] | Mar. 31, 2013 Contran [Member] Libor [Member] | Mar. 31, 2013 Contran [Member] Base Rate [Member]
Debt Instrument [Line Items] |  |  |  |  |
Revolving credit facility, borrowings |  | $ 290.0 |  |  |
Payment of Principal Amount |  |  | $ 5.0 |  |
LIBOR interest rate |  |  | The note bears interest at LIBOR (with LIBOR no less than 1%) plus 4.125%, or the base rate (as defined in the agreement) plus 5.125%. |  |
Debt instrument interest rate |  |  |  | 4.125% | 5.125%
Percentage of average interest rate, during period | 6.60% |  | 7.375% |  |
Percentage of average interest rate | 7.00% |  | 7.375% |  |

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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + 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 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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