Weighted Average Common Shares - Summary of Weighted Average Numbers of Common Shares Used to Compute Basic and Diluted Net (Loss) Income Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Basic common shares outstanding	69,414	70,088	69,598
Common stock equivalents	1,851	1,997	1,884
Diluted common shares outstanding	71,265	72,085	71,482