Treasury Stock (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	May 31, 2013
Equity, Class of Treasury Stock [Line Items]
Treasury Stock as of February 28, 2013	8,824,172
Repurchases During the Three Months Ended May 31, 2013
Treasury Stock as of May 31, 2013	8,824,172
Treasury Stock as of February 28, 2013	$ 76,756
Repurchases During the Three Months Ended May 31, 2013
Treasury Stock as of May 31, 2013	$ 76,756
Treasury Stock as of February 28, 2013	$ 8.70
Repurchases During the Three Months Ended May 31, 2013
Treasury Stock as of May 31, 2013	$ 8.70