Equity-Based Compensation - Schedule of Activity Related to Stock Option Awards (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options, Outstanding, Beginning Balance | shares	2,274,385
Options, granted | shares	1,472,937
Options, Forfeited | shares	(266,307)
Options, Expired | shares	(34,784)
Options, Exercised | shares	(4,331)
Options, Outstanding, Ending Balance | shares	3,441,900
Options, Exercisable at December 31, 2016 | shares	523,125
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ / shares	$ 19.21
Weighted Average Exercise Price, Granted | $ / shares	17.83
Weighted Average Exercise Price, Forfeited | $ / shares	18.60
Weighted Average Exercise Price, Expired | $ / shares	18.96
Weighted Average Exercise Price, Exercised | $ / shares	18.96
Weighted Average Exercise Price, Outstanding, Ending Balance | $ / shares	18.67
Weighted Average Exercise Price, Exercisable at December 31, 2016 | $ / shares	$ 19.23
Weighted Average Remaining Contractual Life, Outstanding at December 31, 2016	8 years 8 months 1 day
Weighted Average Remaining Contractual Life, Exercisable at December 31, 2016	8 years 3 months 26 days
Aggregate Intrinsic Value, Outstanding at December 31, 2016 | $	$ 2,091
Aggregate Intrinsic Value, Exercisable at December 31, 2016 | $	$ 140