Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Shares
Outstanding at beginning of period	734,721
Granted
Exercised	(66,667)
Forfeited
Outstanding at end of period	668,054	734,721
Exercisable at end of period	335,000
Weighted Average Exercise Price
Outstanding at beginning of period	$ 12.73
Granted
Exercised	$ 11.36
Forfeited
Outstanding at end of period	$ 12.86	$ 12.73
Exercisable at end of period	$ 11.71
Weighted Average Remaining Contractual Term (Years)
Granted	0 years
Exercised	0 years
Forfeited	0 years
Outstanding	7 years 3 months 18 days	7 years 6 months
Exercisable at end of period	7 years 7 months 6 days
Aggregate Intrinsic Value
Outstanding at beginning of period	$ 741
Granted
Exercised
Forfeited
Outstanding at end of period	188	741
Exercisable at end of period	$ 188