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Long-Term Debt (Details Textual) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 6 Months Ended |  | 6 Months Ended | 1 Months Ended | 6 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 USD ($) | Jun. 30, 2012 CAD | Mar. 31, 2012 USD ($) | Mar. 31, 2011 USD ($) | Mar. 31, 2011 EUR (€) | Jun. 30, 2012 USD ($) | Jun. 30, 2012 EUR (€) | Sep. 30, 2011 EUR (€) | Dec. 31, 2011 EUR (€) | Jun. 30, 2012 Kronos US Subsidiaries [Member] | Jun. 30, 2012 Kronos Canada [Member] | Jun. 30, 2012 Kronos [Member] USD ($) | Jun. 30, 2012 Kronos International [Member] USD ($) | Jun. 30, 2012 CompX [Member] | May 31, 2012 NL Industries Inc [Member] USD ($) | Jun. 30, 2012 NL Industries Inc [Member] | Jun. 30, 2012 Letter of Credit [Member] USD ($) | Jun. 30, 2012 Letter of Credit [Member] CAD | Jun. 30, 2012 Revolving Credit Facility [Member] USD ($) | Dec. 31, 2011 Senior Secured Notes Repurchased Aggregate [Member] USD ($) | Dec. 31, 2011 Senior Secured Notes Repurchased Aggregate [Member] EUR (€) | Jun. 30, 2012 Senior Secured Notes Repurchased Aggregate [Member] EUR (€)
Long-Term Debt (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | $ 400.0 |  |  |  |  | $ 400.0 |  |  |  |  |  | $ 394.0 |  |  |  |  |  |  |  |  |  |
Additional term loan borrowings | 100 |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of term loan issued | 98.50% | 98.50% |  |  |  | 98.50% | 98.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum LIBOR rate for Kornos Option |  |  |  |  |  | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate on LIBOR for term loan |  |  |  |  |  | 4.75% | 4.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Rate on Base Rate for term loan |  |  |  |  |  | 3.75% | 3.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock of certain of Kronos U.S. wholly-owned subsidiaries/Common stock or other ownership interest of Kronos Canadian subsidiary |  |  |  |  |  |  |  |  |  | 100.00% | 65.00% |  |  |  |  |  |  |  |  |  |  |
Unsecured promissory note issued by Kronos wholly-owned subsidiary |  |  |  |  |  |  |  |  |  |  |  |  | 362.1 |  |  |  |  |  |  |  |  |
Principal repayments |  |  |  |  |  | 5.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Specified financial covenant (leverage to EBITDA) |  |  |  |  |  | 3.5 to 1.0 | 3.5 to 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for other indebtedness | 50 |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of term loan includes unamortized original issue discount | 6.0 |  |  |  |  | 6.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  | 115.7 | 80.0 |  |  | 40.8 | 40.8 |  |  |  |  |  |  |  |  |  |  | 57.6 | 40.6 |
6.5% Senior secured notes |  |  |  |  | 400.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of senior secured notes |  |  |  | 6.50% | 6.50% |  |  |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Effective percentage senior secured notes |  |  |  | 102.17% | 102.17% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Call premium of senior long term notes |  |  |  | 2.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 279.2
Pre tax charge on redemption of senior long term notes |  |  |  | 3.3 |  | 7.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan sufficient to pay principal, call premium |  |  |  |  |  | 1.01083% | 1.01083% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate on LIBOR for revolving credit facility, Minimum |  |  |  |  |  | 1.50% | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate on LIBOR for revolving credit facility, Maximum |  |  |  |  |  | 2.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Rate on Base Rate for revolving credit facility, Minimum |  |  |  |  |  | 0.50% | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Rate on Base Rate for revolving credit facility, Maximum |  |  |  |  |  | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio, Range Start |  |  |  |  |  | 1.0 | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed charge coverage ratio, Range End |  |  |  |  |  | 1.0 | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings under credit facility |  |  |  |  |  | 107.4 | 80.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate on revolving bank credit facility | 6.25% | 6.25% |  |  |  | 5.75% | 5.75% |  |  |  |  |  |  | 3.40% |  |  |  |  |  |  |  |
Average interest rate on revolving bank credit facility | 1.88% | 1.88% |  |  |  | 1.88% | 1.88% |  |  |  |  |  |  | 3.80% |  |  |  |  |  |  |  |
Promissory note issued in conjunction with a litigation settlement |  |  | 1.00 |  |  | 1.25 |  |  |  |  |  |  |  |  | 3.90 |  |  |  |  |  |  |
Average interest rate | 1.94% | 1.94% |  |  |  | 1.94% | 1.94% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  | 7.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount available for borrowing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125 |  |  |
Borrowing availability | $ 15.0 |  |  |  |  | $ 15.0 |  |  |  |  |  |  |  |  |  |  | $ 25.0 | 10.0 | $ 125.0 |  |  |
Interest rate for promissory note |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  | 3.25% |  |  |  |  |  |
Interest rate on outstanding indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  | 3.25% |  |  |  |  |  |

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- Definition Line of credit facility amount outstanding during period. + References No definition available. + Details
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Namespace Prefix: | vhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line of credit facility basis spread on London inter bank offered rate maximum. + References No definition available. + Details
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Namespace Prefix: | vhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of credit facility basis spread on London inter bank offered rate minimum. + References No definition available. + Details
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Namespace Prefix: | vhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of credit facility financial covenant ratio range end. + References No definition available. + Details
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Namespace Prefix: | vhi_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of credit facility financial covenant ratio range start. + References No definition available. + Details
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Namespace Prefix: | vhi_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Minimum percentage for London inter bank offered rate. + References No definition available. + Details
Name: | vhi_MinimumPercentageForLondonInterBankOfferedRate
Namespace Prefix: | vhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Term loan. + References No definition available. + Details
Name: | vhi_TermLoan
Namespace Prefix: | vhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Term loan additional borrowings. + References No definition available. + Details
Name: | vhi_TermLoanAdditionalBorrowings
Namespace Prefix: | vhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Term loan issue price percentage principal. + References No definition available. + Details
Name: | vhi_TermLoanIssuePricePercentagePrincipal
Namespace Prefix: | vhi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Unsecured promissory note issued. + References No definition available. + Details
Name: | vhi_UnsecuredPromissoryNoteIssued
Namespace Prefix: | vhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration