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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Weighted average number of common shares outstanding		84,912	83,490	84,660	83,061
Weighted average number of dilutive common share equivalents		1,021	254	993	0
Weighted average number of common and common equivalent shares outstanding	[1]	85,933	83,744	85,653	83,061
Antidilutive securities not included in the diluted net income per common share calculation		13	1,335	15	1,092

[1] Due to a loss from continuing operations for the six months ended June 30, 2020, no incremental shares are included because the effect would be antidilutive.