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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Dividends received from Kronos Worldwide, Inc. |  |  |  | $ 25,356 | $ 25,356 | $ 25,356
Gross unrecognized tax benefits |  | $ 7,300 |  | 7,300 | 7,300 | 7,300
Uncertain tax position |  |  |  | 1,724 | 1,717 |
Unrecognized tax benefits, if recognize which would affect effective tax rate |  |  |  | 7,300 |  |
Currently payable |  |  |  |  |  | 200
Income tax expense (benefit) |  |  |  | (7,479) | 2,515 | (579)
Current payable to affiliate |  |  |  | 691 | 725 |
Valhi | Income Tax Payable |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Payable to affiliate |  |  |  | 50,600 |  |
Federal Income Tax Purposes |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | $ 26,600 |  |
Annual usage limitation |  |  |  | 80.00% |  |
Net operating loss carryforwards expiration description |  |  |  | an indefinite carryforward period subject to an 80% annual usage limitation |  |
Kronos |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Dividends received from Kronos Worldwide, Inc. |  |  |  | $ 25,400 | $ 25,400 | $ 25,400
Kronos | CARES Act |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Cash tax benefit due to reversal of valuation allowance | $ 500 |  |  |  |  |
Percentage of adjusted taxable income |  |  |  |  | 50.00% | 30.00%
Interest expense and an increase in the valuation allowance |  |  |  | 2,800 |  |
Kronos | Germany |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Income tax benefit |  | 3,000 |  |  |  |
Current cash tax benefit |  | 1,500 |  |  |  |
Non-cash deferred income tax benefit |  | 1,500 |  |  |  |
Deferred income tax expense resulting from decrease in trade tax rate |  | $ 5,500 |  |  |  |
Kronos | Deferred Tax Liability Non Current |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Uncertain tax position |  |  |  | 5,600 |  |
Kronos | Corporate Tax Purposes | German |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | 451,000 |  |
Kronos | Corporate Tax Purposes | Belgium |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | $ 19,000 |  |
Kronos European Subsidiaries | Transition Tax |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Currently payable |  |  | $ 74,500 |  |  |
Current income tax expense payment period |  |  | 8 years |  |  |
Kronos European Subsidiaries | Valhi |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Income tax liability payable period |  |  |  | 8 years |  |
Kronos European Subsidiaries | Valhi | Income Tax Payable |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Payable to affiliate |  |  |  | $ 50,600 |  |
Noncurrent payable to affiliate |  |  |  | 44,700 |  |
Current payable to affiliate |  |  |  | $ 5,900 |  |

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