Share-based Compensation - Schedule of Stock Option Plans (Detail)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at the beginning of the period (in shares) | shares	1,412,602
Granted | shares	250,432
Exercised | shares	(469,945)
Forfeited | shares	(55,910)
Outstanding at the end of the period (in shares) | shares	1,137,179
Vested and expected to vest | shares	1,137,179
Exercisable (in shares) | shares	464,206
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 34.26
Granted | $ / shares	43.04
Exercised | $ / shares	34.50
Forfeited | $ / shares	35.04
Outstanding at the end of the period (in dollars per share) | $ / shares	36.05
Vested and expected to vest | $ / shares	36.05
Exercisable | $ / shares	$ 33.76
Options outstanding, weighted average remaining contractual term	6 years 8 months 9 days
Options vested and expected, weighted average remaining contractual term	6 years 8 months 9 days
Options exercisable, weighted average remaining contractual term	4 years 6 months 26 days