Equity-Based Compensation - Schedule of Activity Related to Stock Option Awards (Detail) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options, Outstanding, Beginning Balance | shares	764,577
Options, Granted | shares	430,390
Options, Forfeited | shares	(55,379)
Options, Expired | shares	(8,593)
Options, Exercised | shares	(39,928)
Options, Outstanding, Ending Balance | shares	1,091,067
Options, Exercisable at March 31, 2019 | shares	556,676
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ / shares	$ 18.05
Weighted Average Exercise Price, Granted | $ / shares	25.70
Weighted Average Exercise Price, Forfeited | $ / shares	19.36
Weighted Average Exercise Price, Expired | $ / shares	18.52
Weighted Average Exercise Price, Exercised | $ / shares	17.90
Weighted Average Exercise Price, Outstanding, Ending Balance | $ / shares	21.00
Weighted Average Exercise Price, Exercisable at March 31, 2019 | $ / shares	$ 18.28
Weighted Average Remaining Contractual Life, Outstanding at March 31, 2019	7 years 10 months 6 days
Weighted Average Remaining Contractual Life, Exercisable at March 31, 2019	6 years 5 months 19 days
Aggregate Intrinsic Value, Outstanding at March 31, 2019 | $	$ 5,188
Aggregate Intrinsic Value, Exercisable at March 31, 2019 | $	$ 4,163