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Long-Term Debt - Note Payable to Contran - Additional Information (Detail) (Kronos Worldwide, Inc., Contran, USD $) In Millions, unless otherwise specified | 1 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 28, 2013 | Jun. 30, 2013
Debt Instrument [Line Items] |  |
Promissory Note, maximum capacity | $ 290.0 |
Payment of Principal Amount |  | $ 5.0
Percentage of average interest rate, during period |  | 7.375%
Percentage of average interest rate |  | 7.375%
Term loan maturity date | Jun. 30, 2018 |
LIBOR |  |
Debt Instrument [Line Items] |  |
Interest rate terms |  | (with LIBOR no less than 1%) plus 5.125%
Debt instrument interest rate |  | 5.125%
Base Rate |  |
Debt Instrument [Line Items] |  |
Interest rate terms |  | rate (as defined in the agreement) plus 4.125%
Debt instrument interest rate |  | 4.125%

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