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Business Segment Information - Holding Percentage of Subsidiaries (Detail) | Jun. 30, 2018
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Kronos Worldwide, Inc. |
Segment Reporting Information [Line Items] |
Parent company ownership interest | 50.00%
BMI |
Segment Reporting Information [Line Items] |
Parent company ownership interest | 63.00%
LandWell |
Segment Reporting Information [Line Items] |
Parent company ownership interest | 27.00%
Chemicals | Kronos Worldwide, Inc. |
Segment Reporting Information [Line Items] |
Controlling interest in subsidiary | 80.00%
Component Products | CompX |
Segment Reporting Information [Line Items] |
Parent company ownership interest | 87.00%
Real Estate Management And Development | BMI |
Segment Reporting Information [Line Items] |
Parent company ownership interest | 63.00%
Real Estate Management And Development | LandWell | Aggregate General And Limited Interests |
Segment Reporting Information [Line Items] |
Controlling interest in subsidiary | 77.00%

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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 Minority interest controlling percentage in subsidiary by parent. + References No definition available. + Details
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Namespace Prefix: | vhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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