Share Based Payments Summary of Stock Options Outstanding and Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Aug. 31, 2013
Options
Outstanding, beginning of period	7,132,459
Granted	381,219
Exercised	169,500	[1]
Forfeited	15,000
Expired	551,220
Outstanding, end of period	6,777,958
Exercisable, end of period	3,658,269
Price
Outstanding, beginning of period	$ 4.31
Granted	$ 1.77
Exercised	$ 0.71	[1]
Forfeited	$ 0.70
Expired or exchanged	$ 10.91
Outstanding, end of period	$ 3.71
Exercisable, end of period	$ 6.04
Outstanding	6 years 4 months 24 days
Exercisable, end of period	4 years 6 months
Outstanding, end of period	$ 12,380
Exercisable, end of period	$ 5,525

[1] The Company did not record an income tax benefit related to option exercises in the six months ended August 31, 2012 and 2013.