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Valhi Stockholders' Equity - Additional Information (Detail) shares in Millions | Mar. 31, 2023 shares
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Kronos |
Schedule Of Stockholders Equity [Line Items] |
Shares available for purchase | 1.2

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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Schedule of stockholders equity. + References No definition available. + Details
Name: | vhi_ScheduleOfStockholdersEquityLineItems
Namespace Prefix: | vhi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ConsolidatedEntitiesAxis=vhi_KronosMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |