Equity-Based Compensation - Schedule of Activity Related to Stock Option Awards (Detail)	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options, Outstanding, Beginning Balance | shares	2,274,385
Options, granted | shares	1,366,973
Options, Forfeited | shares	(147,132)
Options, Expired | shares	(6,552)
Options, Exercised | shares	(4,331)
Options, Outstanding, Ending Balance | shares	3,483,343
Options, Exercisable at June 30, 2016 | shares	446,972
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ / shares	$ 19.21
Weighted Average Exercise Price, Granted | $ / shares	18.11
Weighted Average Exercise Price, Forfeited | $ / shares	18.73
Weighted Average Exercise Price, Expired | $ / shares	18.96
Weighted Average Exercise Price, Exercised | $ / shares	18.96
Weighted Average Exercise Price, Outstanding, Ending Balance | $ / shares	18.80
Weighted Average Exercise Price, Exercisable at June 30, 2016 | $ / shares	$ 19.60
Weighted Average Remaining Contractual Life, Outstanding at June 30, 2016	9 years 1 month 21 days
Weighted Average Remaining Contractual Life, Exercisable at June 30, 2016	8 years 8 months 23 days