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Long-Term Debt - Kronos Term Loan - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2015 | Feb. 28, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |
Repayment of credit facility |  |  | $ 309,000,000 | $ 53,400,000 | $ 343,100,000
Kronos Worldwide, Inc. | Notes Payable, Other Payables | Contran |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayment of credit facility |  | $ 170,000,000 |  |  |
Kronos Worldwide, Inc. | Notes Payable, Other Payables | 2014 Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount of promissory note |  | 350,000,000 |  |  |
Borrowings for prepayment of term loan |  | $ 348,300,000 |  |  |
Percentage of loan issued to principal amount |  | 99.50% |  |  |
Quarterly principal repayments | $ 875,000 |  |  |  |
Quarterly principal repayments, commencing date | Jun. 30, 2014 |  |  |  |
Loans maturity period | Feb. 29, 2020 |  |  |  |
Long term debt prepayments terms |  |  | Voluntary principal prepayments are permitted at any time |  |
Minimum amount of debt default for using customary default provisions |  |  | $ 50,000,000 |  |
Refinancing fee | $ 750,000 |  |  |  |
Debt instrument, Effective interest rate at period end |  |  | 4.00% |  |
Unamortized discount balance |  |  | $ 900,000 | 1,200,000 |
Debt issuance cost |  |  | $ 3,600,000 | $ 4,700,000 |
Kronos Worldwide, Inc. | Notes Payable, Other Payables | 2014 Term Loan | Unsecured Promissory Note Issued by Kronos International, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loan pledged as collateral from wholly-owned subsidiary | $ 395,700,000 |  |  |  |
Kronos Worldwide, Inc. | Notes Payable, Other Payables | 2014 Term Loan | U.S. wholly-owned subsidiaries |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term Loan Collateralized Priority | 100.00% |  |  |  |
Kronos Worldwide, Inc. | Notes Payable, Other Payables | 2014 Term Loan | Canadian first-tier European subsidiaries |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term Loan Collateralized Priority | 65.00% |  |  |  |
Kronos Worldwide, Inc. | Notes Payable, Other Payables | 2014 Term Loan | Libor Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Minimum LIBOR rate | 1.00% |  |  |  |
Debt instrument basis spread on variable rate | 3.00% |  |  |  |
Kronos Worldwide, Inc. | Notes Payable, Other Payables | 2014 Term Loan | Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument basis spread on variable rate | 2.00% |  |  |  |
Kronos Worldwide, Inc. | Notes Payable, Other Payables | 2014 Term Loan Superseded | Libor Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument basis spread on variable rate |  | 3.75% |  |  |
Kronos Worldwide, Inc. | Notes Payable, Other Payables | 2014 Term Loan Superseded | Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument basis spread on variable rate |  | 2.75% |  |  |

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