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Financial Instruments - Financial Instruments not Carried at Fair Value (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncontrolling interest in subsidiaries | $ 336.3 us-gaap_MinorityInterest | $ 391.5 us-gaap_MinorityInterest
Valhi stockholders' equity | 477.6 us-gaap_StockholdersEquity | 601.3 us-gaap_StockholdersEquity
Kronos Worldwide, Inc. |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncontrolling interest in subsidiaries | 211.0 us-gaap_MinorityInterest / dei_LegalEntityAxis = vhi_KronosMember | 241.9 us-gaap_MinorityInterest / dei_LegalEntityAxis = vhi_KronosMember
Kronos Worldwide, Inc. | Term Loan |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 345.9 us-gaap_LongTermDebt / dei_LegalEntityAxis = vhi_KronosMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember |
Long term debt, fair value | 341.5 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = vhi_KronosMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember |
Kronos Worldwide, Inc. | Notes Payable, Other Payables | Contran |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount |  | 170.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = vhi_KronosMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vhi_ContranMember
Long term debt, fair value |  | 170.0 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = vhi_KronosMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vhi_ContranMember
Kronos Worldwide, Inc. | Credit Facility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount |  | 11.1 us-gaap_LongTermDebt / dei_LegalEntityAxis = vhi_KronosMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Long term debt, fair value |  | 11.1 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = vhi_KronosMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Snake River | Term Loan |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 250.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = vhi_SnakeRiverMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember | 250.0 us-gaap_LongTermDebt / dei_LegalEntityAxis = vhi_SnakeRiverMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember
Long term debt, fair value | 250.0 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = vhi_SnakeRiverMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember | 250.0 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = vhi_SnakeRiverMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember
WCS | Fixed Rate Loans |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 67.1 us-gaap_LongTermDebt / dei_LegalEntityAxis = vhi_WcsMember / us-gaap_LongtermDebtTypeAxis = vhi_FixedRateMortgageLoansMember | 72.4 us-gaap_LongTermDebt / dei_LegalEntityAxis = vhi_WcsMember / us-gaap_LongtermDebtTypeAxis = vhi_FixedRateMortgageLoansMember
Long term debt, fair value | 67.1 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = vhi_WcsMember / us-gaap_LongtermDebtTypeAxis = vhi_FixedRateMortgageLoansMember | 72.4 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = vhi_WcsMember / us-gaap_LongtermDebtTypeAxis = vhi_FixedRateMortgageLoansMember
VALHI, INC. | Credit Facility | Contran |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 223.7 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vhi_ContranMember | 206.5 us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vhi_ContranMember
Long term debt, fair value | 223.7 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vhi_ContranMember | 206.5 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vhi_ContranMember
Tremont | Promissory Note |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 17.4 us-gaap_LongTermDebt / dei_LegalEntityAxis = vhi_TremontMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | 19.1 us-gaap_LongTermDebt / dei_LegalEntityAxis = vhi_TremontMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember
Long term debt, fair value | 17.4 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = vhi_TremontMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember | 19.1 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = vhi_TremontMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember
BMI | Bank note payable |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 10.3 us-gaap_LongTermDebt / dei_LegalEntityAxis = vhi_BmiMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember | 11.2 us-gaap_LongTermDebt / dei_LegalEntityAxis = vhi_BmiMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember
Long term debt, fair value | 10.3 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = vhi_BmiMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember | 11.2 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = vhi_BmiMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableToBanksMember
LandWell |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncontrolling interest in subsidiaries | 24.8 us-gaap_MinorityInterest / dei_LegalEntityAxis = vhi_LandwellMember | 27.8 us-gaap_MinorityInterest / dei_LegalEntityAxis = vhi_LandwellMember
LandWell | Unsecured Debt |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Long term debt, carrying amount | 3.1 us-gaap_LongTermDebt / dei_LegalEntityAxis = vhi_LandwellMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 3.1 us-gaap_LongTermDebt / dei_LegalEntityAxis = vhi_LandwellMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember
Long term debt, fair value | 3.1 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = vhi_LandwellMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 3.1 us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = vhi_LandwellMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember
NL |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncontrolling interest in subsidiaries | 54.4 us-gaap_MinorityInterest / dei_LegalEntityAxis = vhi_NlIndustriesIncMember | 74.5 us-gaap_MinorityInterest / dei_LegalEntityAxis = vhi_NlIndustriesIncMember
CompX |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncontrolling interest in subsidiaries | 14.4 us-gaap_MinorityInterest / dei_LegalEntityAxis = vhi_CompXMember | 13.6 us-gaap_MinorityInterest / dei_LegalEntityAxis = vhi_CompXMember
Reported Value Measurement |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, cash equivalents and restricted cash equivalents | 280.3 vhi_CashAndEquivalentsAndRestrictedCashAndEquivalentsCurrentAndNoncurrentFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 186.8 vhi_CashAndEquivalentsAndRestrictedCashAndEquivalentsCurrentAndNoncurrentFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Deferred payment obligation | 8.5 vhi_DeferredPaymentObligationFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 8.2 vhi_DeferredPaymentObligationFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Valhi stockholders' equity | 477.6 us-gaap_StockholdersEquity / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 601.3 us-gaap_StockholdersEquity / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Reported Value Measurement | Kronos Worldwide, Inc. |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncontrolling interest in subsidiaries | 211.0 us-gaap_MinorityInterest / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / dei_LegalEntityAxis = vhi_KronosMember | 241.9 us-gaap_MinorityInterest / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / dei_LegalEntityAxis = vhi_KronosMember
Reported Value Measurement | NL |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncontrolling interest in subsidiaries | 54.4 us-gaap_MinorityInterest / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / dei_LegalEntityAxis = vhi_NlIndustriesIncMember | 74.5 us-gaap_MinorityInterest / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / dei_LegalEntityAxis = vhi_NlIndustriesIncMember
Reported Value Measurement | CompX |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncontrolling interest in subsidiaries | 14.4 us-gaap_MinorityInterest / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / dei_LegalEntityAxis = vhi_CompXMember | 13.6 us-gaap_MinorityInterest / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / dei_LegalEntityAxis = vhi_CompXMember
Portion at Fair Value Measurement |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, cash equivalents and restricted cash equivalents | 280.3 vhi_CashAndEquivalentsAndRestrictedCashAndEquivalentsCurrentAndNoncurrentFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember | 186.8 vhi_CashAndEquivalentsAndRestrictedCashAndEquivalentsCurrentAndNoncurrentFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember
Deferred payment obligation | 8.5 vhi_DeferredPaymentObligationFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember | 8.2 vhi_DeferredPaymentObligationFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember
Valhi stockholders' equity | 2,173.8 us-gaap_StockholdersEquity / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember | 5,916.7 us-gaap_StockholdersEquity / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember
Portion at Fair Value Measurement | Kronos Worldwide, Inc. |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncontrolling interest in subsidiaries | 295.1 us-gaap_MinorityInterest / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember / dei_LegalEntityAxis = vhi_KronosMember | 431.6 us-gaap_MinorityInterest / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember / dei_LegalEntityAxis = vhi_KronosMember
Portion at Fair Value Measurement | NL |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncontrolling interest in subsidiaries | 71.3 us-gaap_MinorityInterest / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember / dei_LegalEntityAxis = vhi_NlIndustriesIncMember | 92.6 us-gaap_MinorityInterest / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember / dei_LegalEntityAxis = vhi_NlIndustriesIncMember
Portion at Fair Value Measurement | CompX |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncontrolling interest in subsidiaries | $ 19.9 us-gaap_MinorityInterest / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember / dei_LegalEntityAxis = vhi_CompXMember | $ 23.1 us-gaap_MinorityInterest / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtFairValueFairValueDisclosureMember / dei_LegalEntityAxis = vhi_CompXMember

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + 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 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition The fair value of cash and cash equivalent items, current restricted cash and equivalent items and noncurrent restricted cash and equivalent items. This element is for unclassified presentations, so both current and noncurrent components are included. + References No definition available. + Details
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