Stock-Based Compensation - Stock Option Activity (Detail)	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options Outstanding, beginning of period | shares	1,543,912
Options, Granted | shares	114,945
Options, Exercised | shares	(399,844)
Options, Forfeited | shares	(1,878)
Options Outstanding, end of period | shares	1,257,135
Weighted Average Exercise Price, Outstanding, beginning of period | $ / shares	$ 30.03
Weighted Average Exercise Price, Granted | $ / shares	56.93
Weighted Average Exercise Price, Exercised | $ / shares	23.57
Weighted Average Exercise Price, Forfeited | $ / shares	40.40
Weighted Average Exercise Price, Outstanding, end of period | $ / shares	$ 34.53