Weighted Average Common Shares - Additional Information (Detail) - shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Shares granted, restricted stock (in shares)	1,120,836	959,168
Shares granted, performance share units (in shares)	307,999	234,866
Shares granted, stock options (in shares)	686,639	526,968