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Long-term debt - Senior Notes - Additional Information (Detail) |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2024 USD ($) | Feb. 12, 2024 EUR (€) | Sep. 13, 2017 USD ($) | Sep. 13, 2017 USD ($) | Feb. 29, 2024 | Dec. 31, 2023 USD ($) | Feb. 12, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 USD ($) | Sep. 13, 2017 EUR (€)
Senior Notes |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Debt instrument base principal amount |  |  |  |  |  |  |  | € 1,000 |  |
Unamortized debt issuance costs | $ |  |  |  |  |  | $ 1,600,000 |  |  | $ 2,400,000 |
Senior Notes | Subsequent event |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Debt instrument base principal amount |  |  |  |  |  |  | € 1,000 |  |  |
Minimum amount of debt default for using customary default provisions | $ | $ 50,000,000.0 |  |  |  |  |  |  |  |  |
3.75% Senior Secured Notes due September 15, 2025 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount | $ |  |  | $ 3.75 | $ 3.75 |  |  |  |  |  |
Debt instrument interest rate |  |  |  |  |  | 3.75% |  | 3.75% |  |
9.50% Senior Secured Notes | Subsequent event |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount | $ 9.50 |  |  |  |  |  | € 850 |  |  |
Debt instrument interest rate | 9.50% |  |  |  |  |  | 9.50% |  |  |
Debt instrument redemption price percent if experience certain specified change of control events | 101.00% | 101.00% |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | € 325,000,000 |  |  |
Cash consideration |  | € 50,000,000 |  |  |  |  |  |  |  |
Remaining outstanding |  |  |  |  |  |  | 75,000,000 |  |  |
9.50% Senior Secured Notes | Maximum | Subsequent event |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Cash consideration |  | € 150 |  |  |  |  |  |  |  |
9.50% Senior Secured Notes | Minimum | Subsequent event |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  |  |  |  |  | 276,174,000 |  |  |
9.50% Senior Secured Notes | Prior to March 15, 2026 | Subsequent event |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage | 100.00% | 100.00% |  |  |  |  |  |  |  |
9.50% Senior Secured Notes | On or After March 15, 2026 | Maximum | Subsequent event |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage | 104.75% | 104.75% |  |  |  |  |  |  |  |
9.50% Senior Secured Notes | On or After March 15, 2028 | Minimum | Subsequent event |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage | 100.00% | 100.00% |  |  |  |  |  |  |  |
9.50% Senior Secured Notes | On or Before March 15, 2026 | Subsequent event |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Debt instrument, percentage of debt that may be redeemed | 40.00% | 40.00% |  |  |  |  |  |  |  |
Private equity offerings | 109.50% | 109.50% |  |  |  |  |  |  |  |
Redemption percentage | 50.00% | 50.00% |  |  |  |  |  |  |  |
Subordinated, unsecured term loan | Subsequent event |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount | $ 53,700,000 |  |  |  |  |  | € 50,000,000.0 |  |  |
Debt instrument interest rate | 11.50% |  |  |  |  |  | 11.50% |  |  |
Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Debt instrument principal amount |  |  | $ 477,600,000 | $ 477,600,000 |  |  |  |  |  | € 400,000,000
Debt instrument interest rate |  |  | 3.75% | 3.75% |  | 3.75% |  | 3.75% | 3.75% | 3.75%
Debt instrument maturity date |  |  | Sep. 15, 2025 |  |  |  |  |  |  |
Debt instrument, interest payment terms |  |  |  |  |  | bear interest at 3.75% per annum, payable semi-annually on March 15 and September 15 of each year, payments began on March 15, 2018; |  |  |  |
Debt instrument, frequency of periodic payment of interest |  |  |  |  |  | semi-annually |  |  |  |
Debt instrument, date of first semi-annual interest payment |  |  | --03-15 |  |  |  |  |  |  |
Debt instrument, date of second semi-annual interest payment |  |  | --09-15 |  |  |  |  |  |  |
Debt Instrument, date of first required semi-annual payment |  |  | Mar. 15, 2018 |  |  |  |  |  |  |
Debt instrument, redemption, description |  |  |  |  |  | have a maturity date of September 15, 2025. We may redeem the Old Notes at 100%, plus accrued and unpaid interest. If we experience certain specified change of control events as outlined in the indenture governing our Old Notes, we would be required to make an offer to purchase the Old Notes at 101% of the principal amount, plus accrued and unpaid interest. We would also be required to make an offer to purchase a specified portion of the Old Notes at par value, plus accrued and unpaid interest, in the event that we generate 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 as described in the indenture governing our Old Notes; |  |  |  |
Debt instrument redemption price percent if experience certain specified change of control events |  |  |  | 101.00% |  |  |  |  |  |
Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025 | On or After March 15, 2028 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption price percentage |  |  |  | 100.00% |  |  |  |  |  |
Kronos International, Inc | 9.50% Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Debt instrument, interest payment terms |  |  |  |  |  | bear interest at 9.50% per annum, payable semi-annually on March 15 and September 15 of each year, payments begin on September 15, 2024; |  |  |  |
Debt instrument, frequency of periodic payment of interest |  |  |  |  |  | semi-annually |  |  |  |
Debt instrument, date of first semi-annual interest payment |  |  |  |  | --03-15 |  |  |  |  |
Debt instrument, date of second semi-annual interest payment |  |  |  |  | --09-15 |  |  |  |  |
Debt Instrument, date of first required semi-annual payment |  |  |  |  | Sep. 15, 2024 |  |  |  |  |
Kronos International, Inc | 9.50% Senior Secured Notes | Collateral Pledged | Direct Domestic Subsidiary of KII and Guarantors | Subsequent event |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Ownership interest percentage owned by parent | 100.00% |  |  |  |  |  | 100.00% |  |  |
Kronos International, Inc | 9.50% Senior Secured Notes | Collateral Pledged | Non US Subsidiary Directly Owned by KII or any Guarantor | Subsequent event |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Ownership interest percentage owned by parent | 65.00% |  |  |  |  |  | 65.00% |  |  |
Kronos International, Inc | 9.50% Senior Secured Notes | Collateral Pledged | Non US Subsidiary Directly Owned by KII or any Guarantor | Non-voting Common Stock | Subsequent event |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Ownership interest percentage owned by parent | 100.00% |  |  |  |  |  | 100.00% |  |  |

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