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Investment in Affiliate and Other Assets - Components of Net Capitalized Permit Costs (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Other Noncurrent Assets [Line Items] |  |
Net capitalized permit costs | $ 53.2 us-gaap_OtherDeferredCostsNet | $ 59.5 us-gaap_OtherDeferredCostsNet
LLRW License - (expires in 2024) | Permits Subject to Amortization |  |
Other Noncurrent Assets [Line Items] |  |
Net capitalized permit costs | 49.6 us-gaap_OtherDeferredCostsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vhi_PermitsSubjectToAmortizationMember / us-gaap_ProductOrServiceAxis = vhi_LowLevelRadioactiveWasteLicenseMember | 54.0 us-gaap_OtherDeferredCostsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vhi_PermitsSubjectToAmortizationMember / us-gaap_ProductOrServiceAxis = vhi_LowLevelRadioactiveWasteLicenseMember
Byproduct License - (expires in 2018) | Permits Subject to Amortization |  |
Other Noncurrent Assets [Line Items] |  |
Net capitalized permit costs | 3.5 us-gaap_OtherDeferredCostsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vhi_PermitsSubjectToAmortizationMember / us-gaap_ProductOrServiceAxis = vhi_ByproductLicenseMember | 4.6 us-gaap_OtherDeferredCostsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vhi_PermitsSubjectToAmortizationMember / us-gaap_ProductOrServiceAxis = vhi_ByproductLicenseMember
Other - (expires 2014 - 2024) | Permits Subject to Amortization |  |
Other Noncurrent Assets [Line Items] |  |
Net capitalized permit costs | $ 0.1 us-gaap_OtherDeferredCostsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vhi_PermitsSubjectToAmortizationMember / us-gaap_ProductOrServiceAxis = vhi_OtherOperatingPermitsMember | $ 0.9 us-gaap_OtherDeferredCostsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vhi_PermitsSubjectToAmortizationMember / us-gaap_ProductOrServiceAxis = vhi_OtherOperatingPermitsMember

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- Definition Net amount of other deferred costs capitalized at the end of the reporting period. Does not include deferred finance costs or deferred acquisition costs of insurance companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | vhi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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