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Long-Term Debt - Tremont - Additional Information (Detail) (Tremont, Promissory Note, USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Tremont | Promissory Note |
Line Of Credit Facility [Line Items] |
Payment of principal amount | $ 0.1 us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = vhi_TremontMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember

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- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration