Share-Based Compensation - Summary of Stock Option Activity (Detail) - Jun. 30, 2015 - Stock Option - USD ($) $ / shares in Units, $ in Thousands	Total
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Options, Outstanding, Beginning balance	3,168,067
Number of Options, Granted	600
Number of Options, Exercised	(31,168)
Number of Options, Forfeited	0
Number of Options, Outstanding, Ending balance	3,137,499
Exercisable at June 30, 2015	586,858
Weighted-average Exercise Price, Outstanding, Beginning balance	$ 12.61
Weighted-average Exercise Price, Granted	26.89
Weighted average Exercise Price, Exercised	10.53
Weighted-average Exercise Price, Forfeited	0.00
Weighted-average Exercise Price, Outstanding, Ending balance	12.63
Weighted-average Exercise Price, Exercisable	$ 8.95
Weighted-average Remaining Contractual Term in Years, Outstanding	6 years 8 months 23 days
Weighted-average Remaining Contractual Term in Years, Exercisable	4 years 9 months
Aggregate Intrinsic Value, Exercised	$ 455
Aggregate Intrinsic Value, Outstanding	44,744
Aggregate Intrinsic Value, Exercisable	$ 10,533