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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |
Liability for uncertain tax positions | $ 2.1 | $ 3.8
Reversal of liability for uncertain tax positions | $ 2.2 |
Minimum |  |
Income Taxes [Line Items] |  |
Effective tax rate | 29.40% |
Maximum |  |
Income Taxes [Line Items] |  |
Effective tax rate | 37.10% |

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