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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 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]                      
Weighted average number of common shares outstanding 84,316 83,862 83,490 82,799 82,592 82,441 83,234 86,073 83,395 83,495 91,104
Weighted average number of dilutive common share equivalents                   516 502
Weighted average number of common and common equivalent shares outstanding 85,082 83,862 83,744 82,799 83,288 82,883 83,689 86,545 83,395 84,011 91,606
Antidilutive securities not included in the diluted net income per common share calculation                 1,034 516 214