Share-based Compensation - Schedule of Stock Option Plans (Detail)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at the beginning of the period (in shares) | shares	1,301,314
Granted | shares	352,535
Exercised | shares	(86,945)
Forfeited or expired | shares	(75,885)
Outstanding at the end of the period (in shares) | shares	1,491,019
Vested and expected to vest | shares	1,491,019
Exercisable (in shares) | shares	908,042
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 42.92
Granted | $ / shares	27.86
Exercised | $ / shares	31.56
Forfeited or expired | $ / shares	52.11
Outstanding at the end of the period (in dollars per share) | $ / shares	39.56
Vested and expected to vest | $ / shares	39.56
Exercisable | $ / shares	$ 41.56
Options outstanding, weighted average remaining contractual term	5 years 8 months 26 days
Options vested and expected, weighted average remaining contractual term	5 years 8 months 26 days
Options exercisable, weighted average remaining contractual term	3 years 8 months 16 days