Status Of Stock Option Grants Under The Plan (Detail) (USD $)	0 Months Ended		12 Months Ended
	Dec. 20, 2012	Dec. 14, 2006	Dec. 31, 2007	Dec. 31, 2012 Stock Option	Dec. 31, 2011 Stock Option	Dec. 31, 2010 Stock Option	Dec. 31, 2009 Stock Option	Dec. 31, 2008 Stock Option	Dec. 31, 2007 Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding				1,229,659	3,287,159	3,287,159	3,287,159	3,287,159	1,990,000
Granted during the year - Options		1,990,000	1,038,750	0	0	0	0	0	1,317,159
Exercised during the year - Options	(20,000)			0	0	0	0	0	(20,000)
Expired during the year - Options	(1,317,159)			(1,229,659)	(2,057,500)
Outstanding				0	1,229,659	3,287,159	3,287,159	3,287,159	3,287,159
Outstanding and exercisable - Weighted Average Exercise Price				$ 3.21	$ 2.48	$ 2.48	$ 2.48	$ 2.48	$ 2
Granted during the year - Weighted Average Exercise Price		$ 2	$ 3.2	$ 0	$ 0	$ 0	$ 0	$ 0	$ 3.21
Expired during the year - Weighted Average Exercise Price				$ 3.21	$ 2
Exercised during the year - Weighted Average Exercise Price				$ 0	$ 0	$ 0	$ 0	$ 0	$ 2
Outstanding - Weighted Average Exercise Price				$ 0	$ 3.21	$ 2.48	$ 2.48	$ 2.48	$ 2.48
Outstanding - Weighted Average Remaining Contractual Term (Years)				0 years	1 year	1 year 4 months 24 days	2 years 4 months 24 days	3 years 4 months 24 days	4 years 4 months 24 days