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Long-Term Debt - Kronos Term Loan - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 18, 2014 | May. 31, 2015 | Feb. 28, 2014 | Sep. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of credit facility |  |  |  |  | $ 53,400,000 | $ 343,100,000 | $ 693,300,000 |
Loss on prepayment of debt, net |  |  |  |  |  |  | (8,900,000) |
Kronos Worldwide, Inc. | 2014 Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loans maturity period |  | Feb. 28, 2020 |  |  |  |  |  |
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 | 2012 Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of credit facility |  |  |  |  |  |  | 390,000,000 |
Principal amount of promissory note |  |  |  |  |  |  | 400,000,000 | $ 400,000,000
Loss on prepayment of debt, net |  |  |  |  |  |  | 8,900,000 |
Repayments of long term debt from cash on hand |  |  |  | $ 50,000,000 |  |  | 150,000,000 |
Borrowing from Contran for prepayment of term loan |  |  |  |  |  |  | 190,000,000 |
Borrowings for prepayment of term loan |  |  |  |  |  |  | $ 50,000,000 |
Kronos Worldwide, Inc. | Notes Payable, Other Payables | 2014 Term Loan | Libor Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument basis spread on variable rate | 3.75% |  | 3.75% |  |  |  |  |
Kronos Worldwide, Inc. | Notes Payable, Other Payables | 2014 Term Loan | Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument basis spread on variable rate | 2.75% |  | 2.75% |  |  |  |  |
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. 28, 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 |  |  |
Call premium percentage |  | 1.00% |  |  |  |  |  |
Voluntary prepayment, earliest date |  | Nov. 30, 2015 |  |  |  |  |  |
Refinancing fee |  | $ 750,000 |  |  |  |  |  |
Debt instrument, average interest rate during period |  |  |  |  | 4.29% |  |  |
Debt instrument, Effective interest rate at period end |  |  |  |  | 4.00% |  |  |
Unamortized discount balance |  |  |  |  | $ 1,200,000 | 1,500,000 |  |
Debt Issuance Cost |  |  |  |  | $ 4,700,000 | $ 5,000,000 |  |
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% |  |  |  |  |  |

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