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Long-Term Debt - Revolving Credit Facility - Additional Information (Detail) - Kronos Worldwide, Inc. € in Millions, $ in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2017 | Jun. 30, 2017 USD ($) | Jun. 30, 2017 EUR (€)
Foreign Line of Credit | Europe |  |  |
Line Of Credit Facility [Line Items] |  |  |
Amount available for borrowing |  | $ 137.1 | € 120.0
Line of credit, maturity date |  | Sep. 30, 2017 |
North American Revolving Credit Facility |  |  |
Line Of Credit Facility [Line Items] |  |  |
Line of credit maturity, description |  | In January 2017, Kronos extended the maturity date of its North American revolving credit facility to the earlier of (i) January 30, 2022 or (ii) 90 days prior to the maturity date of our existing term loan indebtedness (or 90 days prior to the maturity date of any indebtedness incurred in a permitted refinancing of such existing term loan indebtedness). Based on the February 2020 maturity date of our existing term loan, the maturity date of the North American revolving credit facility is currently November 2019. |
Revolving credit facility, borrowings |  | $ 16.3 |
Debt instrument, Interest rate at period end |  | 5.00% | 5.00%
Debt instrument, average interest rate during period |  | 4.80% |
Amount available for borrowing |  | $ 91.4 |
North American Revolving Credit Facility | Maturity Date Option 1 |  |  |
Line Of Credit Facility [Line Items] |  |  |
Line of credit, maturity date |  | Jan. 30, 2022 |
North American Revolving Credit Facility | Maturity Date Option 2 |  |  |
Line Of Credit Facility [Line Items] |  |  |
Line of credit, maturity date |  | Nov. 30, 2019 |
Maturity date of term loan | 90 days |  |
Maturity date permitted refinancing of term loan | 90 days |  |

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