Stock Compensation - Summary of Activity in Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Outstanding at beginning of year	572,323
Shares, Granted	0	2,192
Shares, Exercised	(8,000)
Shares, Forfeited and expired	(600)
Shares, Outstanding at end of period	563,723
Shares, Options exercisable at end of period	551,775
Weighted average exercise price, Outstanding at beginning of year	$ 2.56
Weighted average exercise price, Exercised	1.48
Weighted average exercise price, Forfeited and expired	2.10
Weighted average exercise price, Outstanding at end of period	2.58
Weighted average exercise price, Options exercisable at the end of period	$ 2.53
Aggregate intrinsic value, Outstanding at end of period	$ 1,854
Aggregate intrinsic value, Options exercisable at the end of period	$ 1,845