Share-based Compensation - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares issued under stock purchase plan, stock option exercises and restricted stock awards and units	194,745	152,885	245,255	186,444