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Commitments and Contingencies - Other Litigation and Other Matters - Additional Information (Detail) | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
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Apr. 30, 2021 | Apr. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) Cases Plaintiff Customer | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2011
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
General and administrative |  |  |  | $ 269,700,000 | $ 276,100,000 | $ 375,100,000 |  |
Rent expense |  |  |  | $ 16,100,000 | $ 16,600,000 | $ 15,800,000 |  |
Chemicals | TiO2 Product |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Sale of TiO2, number of customers | Customer |  |  |  | 4,000 |  |  |  |
Chemicals | Customer Concentration Risk | Behr Process Corporation | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 10.00% | 10.00% | 10.00% |  |
Component Products Segment | Customer Concentration Risk | Top Ten Customers | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 48.00% | 47.00% | 42.00% |  |
Component Products | Customer Concentration Risk | Harley Davidson Inc | Net Sales | Security​ Products​ Reporting​ Unit​ |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 12.00% | 12.00% | 12.00% |  |
Component Products | Customer Concentration Risk | United States Postal Service | Net Sales | Security​ Products​ Reporting​ Unit​ |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 13.00% | 13.00% |  |  |
Waste Management | Customer Concentration Risk | Net Sales | Minimum |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 10.00% | 10.00% | 10.00% |  |
Waste Management | Customer Concentration Risk | Tennessee Valley Authority | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 30.00% |  |
Waste Management | Customer Concentration Risk | Studsvik, Inc. | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 15.00% |  |
Waste Management | Customer Concentration Risk | Department of Energy | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 10.00% |  |
Waste Management | Customer Concentration Risk | Zion Solutions | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 11.00% | 18.00% |  |  |
Waste Management | Customer Concentration Risk | Sacramento Municipal Utility District | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 23.00% |  |  |
Waste Management | Customer Concentration Risk | Exelon Generation | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 19.00% |  |  |  |
Waste Management | Customer Concentration Risk | U.S. Department of Energy | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 16.00% |  |  |  |
Waste Management | Customer Concentration Risk | Nuclear Waste Partnership | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 12.00% |  |  |  |
Waste Management | Customer Concentration Risk | Arizona Public Service | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 12.00% |  |  |  |
Real Estate Management And Development | Customer Concentration Risk | Net Sales | Minimum |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 10.00% | 10.00% |  |  |
Real Estate Management And Development | Customer Concentration Risk | Greystone Nevada | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 23.00% |  |  |
Real Estate Management And Development | Customer Concentration Risk | Woodside Homes of Nevada | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 25.00% |  |  |
Real Estate Management And Development | Customer Concentration Risk | Richmond Homes of Nevada | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 27.00% | 20.00% |  |  |
Real Estate Management And Development | Customer Concentration Risk | City of Henderson | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 15.00% | 12.00% |  |  |
Real Estate Management And Development | Customer Concentration Risk | LV East Gibson, LLC | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 17.00% |  |  |  |
Real Estate Management And Development | Customer Concentration Risk | Prologis, L.P | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 11.00% |  |  |  |
TiO2 | Chemicals | TiO2 Product | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 90.00% | 90.00% | 90.00% |  |
TiO2 | Chemicals | Customer Concentration Risk | Top Ten Customers | Net Sales |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 34.00% | 35.00% | 34.00% |  |
Feedstock Ore | Chemicals |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Minimum purchase commitments |  |  |  | $ 865,000,000 |  |  |  |
Other Supply And Service Contracts | Chemicals |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Minimum purchase commitments |  |  |  | 147,000,000 |  |  |  |
Valhi | Surety Bond | Contran | Waste Control Specialists |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Surety bond purchased from third party insurance company |  | $ 85,300,000 |  |  |  | $ 32,200,000 |  |
Collateral trust as a percent of value of bonds |  |  |  |  |  |  |  | 2.50%
Cash payments to collateral trust |  | 2,000,000 |  | $ 16,100,000 |  |  |  |
Valhi | Surety Bond | Contran | Scenario, Forecast | Waste Control Specialists |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Collateral trust as a percent of value of bonds | 50.00% |  |  |  |  |  |  |
Valhi | Surety Bond | Contran | Quarterly Payment | Waste Control Specialists |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Cash payments to collateral trust |  |  | $ 1,300,000 |  |  |  |  |
Valhi | Second Collateral Trust | Contran | Waste Control Specialists |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  | $ 18,000,000 |
Decrease in restricted cash |  | $ 18,000,000 |  |  |  |  |  |
City of Henderson Redevelopment Agency | OPA​ |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Tax increment reimbursement percentage |  |  |  | 75.00% |  |  |  |
City of Henderson Redevelopment Agency | Maximum | OPA​ |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Reimbursement revenue |  |  |  | $ 209,000,000 |  |  |  |
Product Liability And Occupational Exposure Litigation Claims | NL |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Cases pending | Cases |  |  |  | 102 |  |  |  |
Product Liability And Occupational Exposure Litigation Claims | NL | Pending Claims |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Number of plaintiffs involved | Plaintiff |  |  |  | 588 |  |  |  |
Product Liability And Occupational Exposure Litigation Claims | NL | Administratively Dismissed Claims |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Number of plaintiffs involved | Plaintiff |  |  |  | 8,692 |  |  |  |
Pricing Litigation Settlement | Kronos Worldwide, Inc. |  |  |  |  |  |  |  |
Commitments And Contingent Liabilities [Line Items] |  |  |  |  |  |  |  |
Case conclusion settlement amount |  |  |  |  |  | 35,000,000 |  |
General and administrative |  |  |  |  |  | $ 35,000,000 |  |

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