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v3.20.2

Other Noncurrent Liabilities - Additional Information (Detail) $ in Millions | 1 Months Ended
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Sep. 30, 2020 USD ($)
Nevada Environmental Response Trust |
Line Of Credit Facility [Line Items] |
Repayment of deferred payment obligation | $ 1.2

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Repayment of Deferred payment obligation. + References No definition available. + Details
Name: | vhi_RepaymentOfDeferredPaymentObligation
Namespace Prefix: | vhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_CreditFacilityAxis=vhi_NERTMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |