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Income Taxes - Additional Information (Detail) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 USD ($) | Jun. 30, 2014 CAD | Jun. 30, 2014 USD ($) | Mar. 31, 2014 Net of noncontrolling interest USD ($) | Jun. 30, 2014 Canadian Income Tax Audit USD ($) | Jun. 30, 2014 U.S. Income Tax Audit USD ($) | Jun. 30, 2014 Kronos Worldwide, Inc. Bank Of Montreal CAD | Dec. 31, 2013 Kronos Worldwide, Inc. Bank Of Montreal CAD
Income Taxes Disclosure [Line Items] |  |  |  |  |  |  |  |
Letter of credit collateralized |  | 0.3 |  |  |  |  | 0.3 | 7.9
Unrecognized tax benefits |  |  | 8.8 |  |  |  |  |
Non-cash income tax benefit recognized related to release of portion of reserve for uncertain tax positions |  |  |  |  | 3.0 | 3.1 |  |
Aggregate letters of credit cancelled |  | 7.6 |  |  |  |  |  |
Provision for income taxes related to previous periods | $ 1.0 |  |  | $ 0.9 |  |  |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28446-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28511-109314 + Details
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- Definition Aggregate amount of letters of credit cancelled. + References No definition available. + Details
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