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Common and Common Equivalent Shares - Schedule of Calculation of Shares Used in Basic and Diluted Net Income Per Share (Detail) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]        
Weighted average number of common shares outstanding 92,604 92,949 92,336 93,195
Weighted average number of dilutive common share equivalents 542 697 709 928
Weighted average number of common and common equivalent shares outstanding 93,146 93,646 93,045 94,123
Antidilutive securities not included in the diluted net income per common share calculation     2