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Employee Benefit Plans - Schedule of Aggregate Fair Value of Asset and Supplemental Asset Mix (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset value | $ 715.5 vhi_CombinedMasterRetirementTrustAssetValue | $ 722.8 vhi_CombinedMasterRetirementTrustAssetValue
CMRT fair value input | 100.00%vhi_PercentageOfCombinedMasterRetirementTrustFairValueInputs | 100.00%vhi_PercentageOfCombinedMasterRetirementTrustFairValueInputs
CMRT asset mix | 100.00%vhi_PercentageOfCombinedMasterRetirementTrustAssetMix | 100.00%vhi_PercentageOfCombinedMasterRetirementTrustAssetMix
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT fair value input | 67.00%vhi_PercentageOfCombinedMasterRetirementTrustFairValueInputs / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 79.00%vhi_PercentageOfCombinedMasterRetirementTrustFairValueInputs / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT fair value input | 13.00%vhi_PercentageOfCombinedMasterRetirementTrustFairValueInputs / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 4.00%vhi_PercentageOfCombinedMasterRetirementTrustFairValueInputs / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT fair value input | 20.00%vhi_PercentageOfCombinedMasterRetirementTrustFairValueInputs / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 17.00%vhi_PercentageOfCombinedMasterRetirementTrustFairValueInputs / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Domestic Equities, Principally Publicly Traded |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 48.00%vhi_PercentageOfCombinedMasterRetirementTrustAssetMix / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = vhi_DomesticEquitiesPrincipallyPublicallyTradedMember | 53.00%vhi_PercentageOfCombinedMasterRetirementTrustAssetMix / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = vhi_DomesticEquitiesPrincipallyPublicallyTradedMember
International Equities, Publicly Traded |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 11.00%vhi_PercentageOfCombinedMasterRetirementTrustAssetMix / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = vhi_InternationalEquitiesPublicallyTradedMember |
Fixed Income Securities, Publicly Traded |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 32.00%vhi_PercentageOfCombinedMasterRetirementTrustAssetMix / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = vhi_FixedIncomeSecuritiesPublicallyTradedMember | 35.00%vhi_PercentageOfCombinedMasterRetirementTrustAssetMix / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = vhi_FixedIncomeSecuritiesPublicallyTradedMember
Privately Managed Limited Partnerships |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 7.00%vhi_PercentageOfCombinedMasterRetirementTrustAssetMix / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = vhi_PrivatelyManagedLimitedPartnershipsMember | 11.00%vhi_PercentageOfCombinedMasterRetirementTrustAssetMix / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = vhi_PrivatelyManagedLimitedPartnershipsMember
Other, Primarily Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 2.00%vhi_PercentageOfCombinedMasterRetirementTrustAssetMix / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember | 1.00%vhi_PercentageOfCombinedMasterRetirementTrustAssetMix / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember

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- Definition Fair value of CMRT plan assets attributable to the defined benefit pension plans to which two or more participating affiliates contribute. + References No definition available. + Details
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- Definition Actual allocation percentage of CMRT plan assets according to the asset category (domestic equities, international equities, fixed income securities, privately managed limited partnerships, other). + References No definition available. + Details
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- Definition Actual allocation percentage of CMRT plan assets according to the fair value input level from the fair value hierarchy (Level I, Level 2 or Level 3). + References No definition available. + Details
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