Stock Compensation - Summary of Activity in Plans (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares, Outstanding at beginning of year	1,309,942
Shares, Granted	12,317
Shares, Exercised	(123,600)
Shares, Forfeited	(241,729)
Shares, Outstanding at end of period	956,930
Shares, Options exercisable at end of period	929,028
Weighted average exercise price, Outstanding at beginning of year	$ 5.77
Weighted average exercise price, Granted	$ 3.54
Weighted average exercise price, Exercised	$ 2.01
Weighted average exercise price, Forfeited	$ 8.82
Weighted average exercise price, Outstanding at end of period	$ 5.46
Weighted average exercise price, Options exercisable at the end of period	$ 5.54
Aggregate intrinsic value, Outstanding at beginning of year	$ 640
Aggregate intrinsic value, Granted
Aggregate intrinsic value, Exercised
Aggregate intrinsic value, Forfeited
Aggregate intrinsic value, Outstanding at end of period	1,102
Aggregate intrinsic value, Options exercisable at the end of period	$ 1,065