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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |  |  |
Valuation allowances | $ 9.4 |  | $ 9.4 |  | $ 1.9
Undistributed non-U.S. subsidiary earnings | 15.7 |  | 15.7 |  |
Unrecognized deferred U.S. income tax liability associated with the indefinitely reinvested undistributed earnings | 5.5 |  | 5.5 |  |
Liability for uncertain tax positions | 2.3 |  | 2.3 |  | 3.8
Reversal of liability for uncertain tax positions |  |  | 2.2 |  |
Effective tax rate | 34.60% | 34.60% | 35.60% | 35.00% |
Discrete Tax Adjustments |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Discrete adjustment to income tax provision | $ 6.9 |  | $ 4.6 |  |
Effective tax rate | 49.80% | 31.30% | 41.30% | 35.00% |

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- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Paragraph Question 1-7 + Details
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