Share-Based Compensation - Summary of Stock Option Activity (Detail) - Stock Option $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Options, Outstanding, Beginning balance (shares) | shares	3,731,761
Number of Options, Granted (shares) | shares	20,000
Number of Options, Exercised (shares) | shares	(40,669)
Number of Options, Forfeited (shares) | shares	(275)
Number of Options, Outstanding, Ending balance (shares) | shares	3,710,817
Number of Options, Exercisable (shares) | shares	896,061
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average Exercise Price, Outstanding, Beginning balance (usd per share) | $ / shares	$ 14.33
Weighted-average Exercise Price, Granted (usd per share) | $ / shares	25.18
Weighted average Exercise Price, Exercised (usd per share) | $ / shares	10.32
Weighted-average Exercise Price, Forfeited (usd per share) | $ / shares	18.19
Weighted-average Exercise Price, Outstanding, Ending balance (usd per share) | $ / shares	14.44
Weighted-average Exercise Price, Exercisable (usd per share) | $ / shares	$ 9.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-average Remaining Contractual Term in Years, Outstanding (years)	6 years 3 months 25 days
Weighted-average Remaining Contractual Term in Years, Exercisable (years)	4 years 22 days
Aggregate Intrinsic Value, Exercised | $	$ 565
Aggregate Intrinsic Value, Outstanding | $	39,696
Aggregate Intrinsic Value, Exercisable | $	$ 13,935