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Long-Term Debt - Kronos Term Loans - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 8 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 13, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Sep. 13, 2017 USD ($) | Dec. 31, 2017 USD ($) | Sep. 13, 2017 EUR (€) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on prepayment of debt |  |  | $ 7,100,000 |  |  | $ 7,100,000 |  |
Kronos Worldwide, Inc. |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Parent company ownership interest |  |  |  |  |  | 50.00% |  |
Kronos Worldwide, Inc. | North American Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | $ 21,000,000 |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Notes Payable, Other Payables | 2014 Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  | $ 338,600,000 |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  |  |  | $ 3,600,000
Quarterly principal payment |  |  |  | $ 1,800,000 |  |  |  |
Debt instrument, voluntary repayment period |  |  |  |  |  | 2017-09 |  |
Loss on prepayment of debt |  |  | 7,100,000 |  |  |  |  |
Write-off of unamortized debt issuance costs |  |  | 2,700,000 |  |  |  |  |
Write-off of unamortized original issue discount |  |  | 700,000 |  |  |  |  |
Termination of interest rate swap contract |  |  | $ 3,300,000 |  |  |  |  |
Debt instrument, average interest rate during period |  |  |  |  | 4.10% |  |  |
Unamortized original issue discount |  |  |  |  |  |  |  | $ 900,000
Kronos Worldwide, Inc. | Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument principal amount | $ 477,600,000 |  |  |  | $ 477,600,000 |  | € 400,000,000 |
Debt instrument maturity date | Sep. 15, 2025 |  |  |  |  |  |  |
Debt instrument interest rate | 3.75% |  |  |  | 3.75% |  | 3.75% |
Debt instrument, interest payment terms |  |  |  |  |  | bear interest at 3.75% per annum, payable semi-annually on March 15 and September 15 of each year, beginning on March 15, 2018 |  |
Debt instrument, frequency of periodic payment of interest |  |  |  |  |  | semi-annually |  |
Debt Instrument, date of first required semi-annual payment | Mar. 15, 2018 |  |  |  |  |  |  |
Debt instrument redemption price percent if experiences certain specified change of control events | 101.00% |  |  |  |  |  |  |
Debt instrument, redemption, description |  |  |  |  |  | have a maturity date of September 15, 2025. Prior to September 15, 2020, Kronos may redeem some or all of the Senior Notes at a price equal to 100% of the principal amount thereof, plus a “make-whole” premium (as defined in the indenture governing the Senior Notes). On or after September 15, 2020, Kronos may redeem the Senior Notes at redemption prices ranging from 102.813% of the principal amount, declining to 100% on or after September 15, 2023. In addition, on or before September 15, 2020, Kronos may redeem up to 40% of the Senior Notes with the net proceeds of certain public or private equity offerings at 103.75% of the principal amount. If Kronos experiences certain specified change of control events, it would be required to make an offer to purchase the Senior Notes at 101% of the principal amount. Kronos would also be required to make an offer to purchase a specified portion of the Senior Notes at par value in the event that it generates a certain amount of net proceeds from the sale of assets outside the ordinary course of business, and such net proceeds are not otherwise used for specified purposes within a specified time period; |  |
Maximum amount of other indebtedness default before triggering customary default provisions | $ 50,000,000 |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  | $ 7,500,000 |  |
Kronos Worldwide, Inc. | Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025 | Collateral Pledged | Direct Domestic Subsidiary of KII and Guarantors |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Parent company ownership interest | 100.00% |  |  |  | 100.00% |  | 100.00% |
Kronos Worldwide, Inc. | Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025 | Collateral Pledged | Foreign Subsidiary Directly Owned by KII or any Guarantor |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Parent company ownership interest | 65.00% |  |  |  | 65.00% |  | 65.00% |
Kronos Worldwide, Inc. | Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025 | Non-voting Common Stock | Collateral Pledged | Foreign Subsidiary Directly Owned by KII or any Guarantor |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Parent company ownership interest | 100.00% |  |  |  | 100.00% |  | 100.00% |
Kronos Worldwide, Inc. | Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025 | Prior to September 15, 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage | 100.00% |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025 | On or After September 15, 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage | 102.813% |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025 | On or After September 15, 2023 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage | 100.00% |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025 | On or Before September 15, 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage | 103.75% |  |  |  |  |  |  |
Kronos Worldwide, Inc. | Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025 | On or Before September 15, 2020 | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, percentage of debt that may be redeemed | 40.00% |  |  |  |  |  |  |

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