Stock-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares Outstanding, Beginning balance	809,017	443,658	215,000
Shares, Granted	139,650	378,692	229,657
Shares, Exercised	(76,966)	0	0
Shares, Forfeited or expired	(16,600)	(13,333)	(999)
Shares Outstanding, Ending balance	855,101	809,017	443,658
Weighted- Average Exercise Price, Beginning balance	$ 11.81	$ 11.11	$ 10.04
Options exercisable	374,535	289,444	270,599
Weighted- Average Exercise Price, Granted	$ 16.16	$ 14.69	$ 12.25
Weighted- Average Exercise Price, Exercised	$ 10.39
Weighted- Average Exercise Price, Forfeited or expired	$ 15.16	$ 14.43	$ 12.23
Weighted- Average Exercise Price, Ending balance	$ 13.48	$ 11.81	$ 11.11
Weighted- Average Exercise Price, Options exercisable	$ 11.94	$ 10.60	$ 10.53
Weighted average remaining contractual term (Years) Options outstanding	7 years
Weighted average remaining contractual term (Years) Options exercisable	6 years