Share-based Compensation Plans - Schedule of Stock Option Activity (Detail)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at the beginning of the period (in shares) | shares	1,527,836
Granted | shares	208,890
Exercised | shares	(93,184)
Forfeited | shares	(230,940)
Outstanding at the end of the period (in shares) | shares	1,412,602
Vested and expected to vest | shares	1,332,992
Options exercisable (in shares) | shares	795,350
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 34.91
Granted | $ / shares	33.28
Exercised | $ / shares	31.19
Forfeited | $ / shares	38.92
Outstanding at the end of the period (in dollars per share) | $ / shares	34.26
Vested and expected to vest | $ / shares	34.39
Options exercisable | $ / shares	$ 35.06
Options outstanding, weighted average remaining contractual term	5 years 2 months 19 days
Options vested and expected, weighted average remaining contractual term	5 years 7 days
Options exercisable, weighted average remaining contractual term	2 years 11 months 16 days