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Common and Common Equivalent Shares - Schedule of Calculation of Shares Used in Basic and Diluted Net Income Per Share (Detail)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Weighted average number of common shares outstanding 99,088 99,506 98,791 99,022
Weighted average number of dilutive common share equivalents 1,057 1,672 1,377 1,940
Weighted average number of common and common equivalent shares outstanding 100,145 101,178 100,168 100,962
Antidilutive securities not included in the dilutive earnings per share calculation       46