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Long-Term Debt - Revolving Credit Facility - Additional Information (Detail) |  | 5 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 20, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 EUR (€)
Line Of Credit Facility [Line Items] |  |  |  |
Revolving credit facility, borrowings |  |  | $ 0 |
Kronos Worldwide, Inc. | Revolving North American Credit Facility |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Revolving credit facility, borrowings |  |  | $ 0 |
Kronos Worldwide, Inc. | Revolving Credit Facility |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit maximum borrowing capacity | $ 225,000,000 |  |  |
Line of credit, maturity month and year | 2026-04 |  |  |
Revolving credit facility, borrowings |  | $ 0 |  |
Amount available for borrowing | $ 225,000,000 |  |  |
Fixed charge coverage ratio, minimum value |  |  | 100.00% |
Kronos Worldwide, Inc. | Revolving Credit Facility | Minimum | Variable Rate |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Interest rate on outstanding borrowings |  |  | 1.50% |
Kronos Worldwide, Inc. | Revolving Credit Facility | Minimum | Base Rate Option |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Interest rate on outstanding borrowings |  |  | 0.50% |
Kronos Worldwide, Inc. | Revolving Credit Facility | Maximum | Variable Rate |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Interest rate on outstanding borrowings |  |  | 2.00% |
Kronos Worldwide, Inc. | Revolving Credit Facility | Maximum | Base Rate Option |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Interest rate on outstanding borrowings |  |  | 2.00% |
Kronos Worldwide, Inc. | European Revolving Credit Facility |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Revolving credit facility, borrowings |  |  | $ 0 |
Kronos Worldwide, Inc. | Canadian Subsidiary Revolving Borrowings Maximum |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit maximum borrowing capacity |  | $ 25,000,000 | $ 25,000,000 |
Kronos Worldwide, Inc. | Belgian Subsidiary Revolving Borrowings Maximum |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit maximum borrowing capacity | € |  |  |  | € 30,000,000
Kronos Worldwide, Inc. | German Subsidiary Revolving Borrowings Maximum |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit maximum borrowing capacity | € |  |  |  | € 60,000,000

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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