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Shares Used in Computing Net Income Per Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Weighted Average Number of Shares Outstanding [Line Items]        
Stock options excluded from the calculation of diluted weighted-average outstanding shares because their impact was anti-dilutive 1.4 1.8 1.1 1.4