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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Abstract]  
Effective tax rate includes favorable tax adjustment $ 2.0
Increase in effective income tax rate Reconciliation 7.80%
Cumulative effect of foreign and state valuation losses 2.40%
Decrease in unrecognized tax positions 12.6
Possible interest and accrued penalties $ 3.2