Common Stock and Share-Based Compensation - Summary of Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares shares
Options
Options outstanding, beginning balance, in shares | shares	3,204,925
Forfeited and canceled, in shares | shares	(908,494)
Exercised, in shares | shares	(191,013)
Options outstanding, ending balance, in shares | shares	2,105,418
Weighted Average Exercise Price
Options outstanding, beginning balance, Weighted average exercise price (in dollars per share) | $ / shares	$ 20.07
Forfeited and canceled, Weighted average exercise price (in dollars per share) | $ / shares	22.20
Exercised, Weighted average exercise price (in dollars per share) | $ / shares	14.02
Options outstanding, ending balance, Weighted average exercise price (in dollars per share) | $ / shares	$ 19.69
Options outstanding and exercisable, ending balance, Weighted Average Contractual Life	2 years
Options outstanding and exercisable, ending balance, Aggregate Intrinsic Value | $	$ 2,623,087