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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Weighted average number of common shares outstanding 85,065 83,862 84,754 83,260
Weighted average number of dilutive common share equivalents [1] 1,031 1,005
Weighted average number of common and common equivalent shares outstanding 86,096 83,862 85,759 83,260
Antidilutive securities not included in the diluted net income per common share calculation 1 829 10 1,004
[1]

(a) Due to a loss from continuing operations for the three and nine months ended September 30, 2020, no incremental shares are included because the effect would be antidilutive.