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Business Segment Information - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2022 USD ($)
Segment Reporting Information [Line Items] |  |
Fixed asset impairment | $ 16.0 | $ 16.0
Kronos Worldwide, Inc. | Valhi Incorporation |  |
Segment Reporting Information [Line Items] |  |
Direct ownership percentage by parent | 50.00% | 50.00%
Kronos Worldwide, Inc. | NL |  |
Segment Reporting Information [Line Items] |  |
Indirect controlling interest in subsidiary | 31.00% | 31.00%
NL | Valhi Incorporation |  |
Segment Reporting Information [Line Items] |  |
Direct ownership percentage by parent | 83.00% | 83.00%
LandWell | Valhi Incorporation |  |
Segment Reporting Information [Line Items] |  |
Direct ownership percentage by parent | 27.00% | 27.00%
LandWell | BMI |  |
Segment Reporting Information [Line Items] |  |
Indirect controlling interest in subsidiary | 50.00% | 50.00%
BMI | Valhi Incorporation |  |
Segment Reporting Information [Line Items] |  |
Direct ownership percentage by parent | 63.00% | 63.00%

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- Details
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