Weighted Average Common Shares - Summary of Weighted Average Numbers of Common Shares Used to Compute 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]
Basic common shares outstanding	70,089	69,167	70,179	69,366
Common stock equivalents	1,377	1,849	1,470	1,901
Diluted common shares outstanding	71,466	71,016	71,649	71,267