Common Stock - Additional Information (Detail) (USD $)	May 31, 2013	Feb. 28, 2013
Common Shares [Line Items]
Common stock, par value	$ 0.02	$ 0.02
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	19,133,731	19,058,923
Common stock, shares outstanding	10,309,559	10,198,121