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Noncontrolling interest in Subsidiaries - Schedule of Noncontrolling Interest in Net Income (Loss) of Subsidiaries (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | $ 25.7 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ (28.9)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 62.3 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Kronos Worldwide, Inc. |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 19.2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = vhi_KronosMember | (20.3)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = vhi_KronosMember | 42.6 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = vhi_KronosMember
NL |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 4.8 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = vhi_NlIndustriesIncMember | (9.4)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = vhi_NlIndustriesIncMember | 15.2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = vhi_NlIndustriesIncMember
CompX |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 1.1 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = vhi_CompXMember | 0.8 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = vhi_CompXMember | 4.5 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = vhi_CompXMember
BMI |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | 0.3 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = vhi_BasicManagementMember |  |
LandWell |  |  |
Noncontrolling interest in net income (loss) of subsidiaries: |  |  |
Noncontrolling interest in net income (loss) of subsidiaries | $ 0.3 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = vhi_LandwellMember |  |

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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 + Details
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