Equity-Based Compensation - Schedule of Activity Related to Stock Option Awards (Detail) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options, Outstanding, Beginning Balance | shares	3,441,900
Options, Forfeited | shares	(171,655)
Options, Expired | shares	(5,890)
Options, Outstanding, Ending Balance | shares	3,264,355
Options, Exercisable at March 31, 2017 | shares	927,474
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ / shares	$ 18.67
Weighted Average Exercise Price, Forfeited | $ / shares	18.32
Weighted Average Exercise Price, Expired | $ / shares	18.96
Weighted Average Exercise Price, Outstanding, Ending Balance | $ / shares	18.69
Weighted Average Exercise Price, Exercisable at March 31, 2017 | $ / shares	$ 18.87
Weighted Average Remaining Contractual Life, Outstanding at March 31, 2017	8 years 4 months 28 days
Weighted Average Remaining Contractual Life, Exercisable at March 31, 2017	8 years 3 months 22 days
Aggregate Intrinsic Value, Outstanding at March 31, 2017 | $	$ 890
Aggregate Intrinsic Value, Exercisable at March 31, 2017 | $	$ 101