XML 45 R35.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Organization and Basis of Presentation - Additional Information (Detail) | 3 Months Ended
--- | ---
Mar. 31, 2018
Valhi Inc | Kronos Worldwide, Inc. |
Organization And Basis Of Presentation [Line Items] |
Ownership percentage in subsidiary | 50.00%
Valhi Inc | NL Industries Inc. |
Organization And Basis Of Presentation [Line Items] |
Ownership percentage in company | 83.00%
NL Industries Inc. | Kronos Worldwide, Inc. |
Organization And Basis Of Presentation [Line Items] |
Ownership percentage | 30.00%
Contran |
Organization And Basis Of Presentation [Line Items] |
Controlling interest description | Consequently, Ms. Simmons and Ms. Connelly may be deemed to control Contran, Valhi, NL and us.
Contran | Valhi Inc |
Organization And Basis Of Presentation [Line Items] |
Ownership percentage of parent company held by related party | 93.00%

X
- Definition Controlling interest description. + References No definition available. + Details
Name: | kro_ControllingInterestDescription
Namespace Prefix: | kro_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Organization and basis of presentation. + References No definition available. + Details
Name: | kro_OrganizationAndBasisOfPresentationLineItems
Namespace Prefix: | kro_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of related party's outstanding common stock owned by parent company. + References No definition available. + Details
Name: | kro_ParentCompanyOwnershipOfRelatedParty
Namespace Prefix: | kro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of outstanding common stock owned by related party. + References No definition available. + Details
Name: | kro_RelatedPartyAndSubsidiaryOwnershipPercentageOutstandingCommonStock
Namespace Prefix: | kro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Related party ownership percentage outstanding common stock. + References No definition available. + Details
Name: | kro_RelatedPartyOwnershipPercentageOutstandingCommonStock
Namespace Prefix: | kro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of parent company's common stock held by private parent company and its subsidiaries. + References No definition available. + Details
Name: | kro_RelatedPartyStockOwnership
Namespace Prefix: | kro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=kro_ValhiIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OwnershipAxis=kro_KronosWorldwideIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OwnershipAxis=kro_NLIndustriesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=kro_NLIndustriesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=kro_ContranCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OwnershipAxis=kro_ValhiIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |