Share-Based Compensation - Summary of Option Activity Under 2013 Plan (Detail) - Option Activity Under the 2013 Plan [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Stock Option Activity [Line Items]
Option outstanding, Shares, Beginning balance	84,147
Option granted, Shares	39,944
Option Exercised, Shares	(666)
Option forfeited, Shares	(2,334)
Option outstanding, Shares, Ending balance	121,091	84,147
Option Exercisable, Shares, Ending balance	41,412
Option outstanding, Weighted Average Exercise Price, Beginning balance	$ 21.24
Option Granted, Weighted Average Exercise Price	23.83
Option Exercised, Weighted Average Exercise Price	20.24
Option Forfeited, Weighted Average Exercise Price	22.62
Option Outstanding, Weighted Average Exercise Price, Ending balance	22.08	$ 21.24
Option Exercisable, Weighted Average Exercise Price, Ending balance	$ 20.90
Option Outstanding, Weighted Average Remaining Contractual Term		8 years 3 months 11 days
Option Exercisable, Weighted Average Remaining Contractual Term		7 years 8 months 16 days
Option outstanding, Aggregate Intrinsic Value	$ 712,506
Option Exercisable, Aggregate Intrinsic Value	$ 292,263