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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Weighted average number of common shares outstanding 83,234 92,987 84,623 92,922
Weighted average number of dilutive common share equivalents 455 542 464 594
Weighted average number of common and common equivalent shares outstanding 83,689 93,529 85,087 93,516
Antidilutive securities not included in the diluted net income per common share calculation 923 392 713 197