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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Income Taxes Disclosure [Line Items] |  |  |  |
U.S. federal statutory income tax rate |  | 35.00% | 35.00% |
Deferred income taxes |  | $ 90.2 | $ 6.5 |
Non-cash income tax benefit recognized related to release of portion of reserve for uncertain tax positions |  | 2.4 |  |
Increase (decrease) in unrecognized tax benefits |  | 6.4 |  |
Chemicals | Employee Severance |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Restructuring charges | $ 21.1 | 21.5 |  |
Kronos Worldwide, Inc. | Germany and Belgian |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Deferred income tax asset valuation allowance | $ 150.3 | 2.3 |  |
Kronos Worldwide, Inc. | Direct investment in subsidiary excess carrying amount |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Deferred income taxes |  | $ 29.7 |  |
Kronos Worldwide, Inc. | Corporate Purposes | German |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Net operating loss carryforwards |  |  |  | $ 738.0
Kronos Worldwide, Inc. | Corporate Purposes | Belgian |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Net operating loss carryforwards |  |  |  | 87.0
Kronos Worldwide, Inc. | Trade Tax Purposes | German |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Net operating loss carryforwards |  |  |  | $ 94.0

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