Stock-Based Compensation - Non-vested Stock Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Number of Options (in shares)
Outstanding at beginning of year	1,914,000	1,902,000	2,856,125
Granted	80,000	70,000	60,000
Outstanding at end of year	1,688,500	1,914,000	1,902,000
Weighted- Average Exercise Price (in dollars per share)
Granted	$ 1.79	$ 1.72	$ 4.08
Non-Vested Stock Options
Number of Options (in shares)
Outstanding at beginning of year	80,500
Granted	80,000
Vested	(148,000)
Forfeited	(2,500)
Outstanding at end of year	10,000
Weighted- Average Exercise Price (in dollars per share)
Outstanding at beginning of year	$ 5.35
Granted	$ 1.79
Vested	$ 3.53
Forfeited	$ 5.98
Outstanding at end of year	$ 3.58