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Long-Term Debt - Revolving Credit Facility - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2017 USD ($)
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] |  |  |  |
Line of credit maximum borrowing capacity | $ 125,000,000 |  |  |
Fixed charge coverage ratio, minimum value | 100.00% |  |  |
Revolving credit facility, borrowings | $ 0 | $ 0 |  |
Repayment of credit facility | $ 0 | 0 |  |
Kronos Worldwide, Inc. | Revolving North American Credit Facility | Maturity Date Option 1 |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit, maturity month and year | 2022-01 |  |  |
Kronos Worldwide, Inc. | Revolving North American Credit Facility | Minimum | Variable Rate |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Interest rate on outstanding borrowings | 1.50% |  |  |
Kronos Worldwide, Inc. | Revolving North American Credit Facility | Minimum | Base Rate Option |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Interest rate on outstanding borrowings | 0.50% |  |  |
Kronos Worldwide, Inc. | Revolving North American Credit Facility | Maximum | Variable Rate |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Interest rate on outstanding borrowings | 2.00% |  |  |
Kronos Worldwide, Inc. | Revolving North American Credit Facility | Maximum | Base Rate Option |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Interest rate on outstanding borrowings | 1.00% |  |  |
Kronos Worldwide, Inc. | North American Revolving Credit Facility |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Amount available for borrowing |  | 107,600,000 |  |
Kronos Worldwide, Inc. | Letter Of Credit | Revolving North American Credit Facility |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit maximum borrowing capacity |  |  |  | $ 15,000,000
Kronos Worldwide, Inc. | Canadian Subsidiary Revolving Borrowings Maximum | Revolving North American Credit Facility |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit maximum borrowing capacity |  |  |  | $ 25,000,000
Kronos Worldwide, Inc. | European Revolving Credit Facility |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit maximum borrowing capacity | € |  |  | € 90,000,000 |
Revolving credit facility, borrowings | $ 0 | 0 |  |
Repayment of credit facility | 0 | $ 0 |  |
Amount available for borrowing | $ 110,300,000 |  | € 90,000,000 |
Line of credit maturity month and year | 2022-09 |  |  |
Outstanding borrowings under revolving credit facility | $ 0 |  |  |
Kronos Worldwide, Inc. | European Revolving Credit Facility | EURIBOR |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Interest rate on outstanding borrowings | 1.60% |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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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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