Stock-Based Compensation - Summary of Stock Option Activity (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning balance, options	359,375
Granted, options	117,600
Exercised, options	(118,090)
Forfeited, options	(5,360)
Ending balance, options	353,525
Exercisable options, ending balance	58,110
Beginning balance, weighted average exercise price | $ / shares	$ 22.03
Ending balance, weighted average exercise price | $ / shares	31.63
Exercisable, weighted average exercisable price | $ / shares	$ 18.53
Outstanding, weighted average remaining contractual life (years)	4 years 8 months 12 days
Exercisable, weighted average remaining contractual life (years)	2 years 1 month 6 days
Outstanding, aggregate intrinsic value | $	$ 427
Exercisable, aggregate intrinsic value | $	$ 427