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Long-Term Debt - Note Payable to Contran - Additional Information (Detail) (Kronos Worldwide, Inc., Contran, USD $) In Millions, unless otherwise specified | 0 Months Ended | 1 Months Ended
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Feb. 18, 2014 | Feb. 28, 2014
Kronos Worldwide, Inc. | Contran |  |
Debt Instrument [Line Items] |  |
Payment of principal amount |  | $ 170.0
Percentage of average interest rate, during period | 7.375% |

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