Stock-Based Compensation - Stock Option Activity (Detail)	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options Outstanding, Beginning balance | shares	1,016,012
Options, Granted | shares	147,848
Options, Exercised | shares	(54,564)
Options, Forfeited | shares	(5,267)
Options Outstanding, Ending balance | shares	1,104,029
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ / shares	$ 44.72
Weighted Average Exercise Price, Granted | $ / shares	55.70
Weighted Average Exercise Price, Exercised | $ / shares	18.99
Weighted Average Exercise Price, Forfeited | $ / shares	54.03
Weighted Average Exercise Price, Outstanding, Ending Balance | $ / shares	$ 47.42