Stock-Based Compensation - Non-vested Stock Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Number of Options (in shares)
Outstanding at beginning of year	1,688,500	1,914,000	1,902,000
Granted	94,500	80,000	70,000
Outstanding at end of year	1,546,500	1,688,500	1,914,000
Weighted- Average Exercise Price (in dollars per share)
Granted	$ 2.20	$ 1.79	$ 1.72
Non-Vested Stock Options
Number of Options (in shares)
Outstanding at beginning of year	10,000
Granted	94,500
Vested	(104,500)
Forfeited	0
Outstanding at end of year	0
Weighted- Average Exercise Price (in dollars per share)
Outstanding at beginning of year	$ 3.58
Granted	$ 2.20
Vested	$ 2.33
Forfeited	$ 0.00
Outstanding at end of year	$ 0.00