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Long-Term Debt - Kronos Term Loan - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended |  |
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Feb. 28, 2014 Kronos Worldwide, Inc. 2014 Term Loan | Jun. 30, 2014 Kronos Worldwide, Inc. 2014 Term Loan | Feb. 28, 2014 Kronos Worldwide, Inc. 2014 Term Loan U.S. wholly-owned subsidiaries | Feb. 28, 2014 Kronos Worldwide, Inc. 2014 Term Loan Canadian first-tier European subsidiaries | Feb. 28, 2014 Kronos Worldwide, Inc. 2014 Term Loan Libor Rate | Feb. 28, 2014 Kronos Worldwide, Inc. 2014 Term Loan Base Rate | Feb. 28, 2014 Kronos Worldwide, Inc. 2014 Term Loan Proceeds Used to Repay Other Debt Instrument | Jul. 31, 2013 Kronos Worldwide, Inc. Term Loan | Feb. 28, 2013 Kronos Worldwide, Inc. Term Loan | Dec. 31, 2013 Kronos Worldwide, Inc. Term Loan | Dec. 31, 2012 Kronos Worldwide, Inc. Term Loan
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of promissory note |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  | $ 400,000,000 | $ 400,000,000
Percentage of loan issued to principal amount |  |  |  |  | 99.50% |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  |  | 348,250,000 |  |  |  |  |  | 170,000,000 |  |  |  |
Minimum LIBOR rate |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |
Debt instrument, Variable rate spread |  |  |  |  |  |  |  |  | 3.75% | 2.75% |  |  |  |  |
Quarterly principal repayments |  |  |  |  | 875,000 |  |  |  |  |  |  |  |  |  |
Quarterly principal repayments, commencing date |  |  |  |  | Jun. 30, 2014 |  |  |  |  |  |  |  |  |  |
Loans maturity period |  |  |  |  | Feb. 28, 2020 |  |  |  |  |  |  |  |  |  |
Long term debt prepayments terms |  |  |  |  | Voluntary principal prepayments are permitted at any time, provided that a call premium of 1% of the principal amount of such prepayment applies to any voluntary prepayment made on or before February 2015 (there is no prepayment penalty applicable to any voluntary prepayment after February 2015) |  |  |  |  |  |  |  |  |  |
Call premium percentage |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Voluntary prepayment, earliest date |  |  |  |  | Feb. 28, 2015 |  |  |  |  |  |  |  |  |  |
Term Loan Collateralized Priority |  |  |  |  |  |  | 100.00% | 65.00% |  |  |  |  |  |  |
Loan pledged as collateral from wholly-owned subsidiary |  |  |  |  | 395,700,000 |  |  |  |  |  |  |  |  |  |
Minimum amount of debt default for using customary default provisions |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |
Percentage of average interest rate, during period |  |  |  |  |  | 4.75% |  |  |  |  |  |  |  |  |
Percentage of average interest rate, end period |  |  |  |  |  | 4.75% |  |  |  |  |  |  |  |  |
Unamortized discount balance |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |
Payment of principal amount |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 | 290,000,000 |  |
Pre-tax interest charge |  |  |  | (6,600,000) |  |  |  |  |  |  |  |  | 6,600,000 |  |
Cash used for payment of term loan |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |
Borrowing from Contran for prepayment of term loan |  |  |  |  |  |  |  |  |  |  |  |  | $ 190,000,000 |  |

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