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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Taxes [Line Items]    
Effective income tax rate 32.10% 31.90%
Reasonably possible decrease in unrecognized tax benefits, minimum $ 2  
Reasonably possible decrease in unrecognized tax benefits, maximum $ 3