Treasury Stock (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Nov. 30, 2012
Equity, Class of Treasury Stock [Line Items]
Treasury Stock as of February 29, 2012	8,540,784
Repurchases During the Nine Months Ended November 30, 2012	283,388
Treasury Stock as of November 30, 2012	8,824,172
Treasury Stock as of February 29, 2012	$ 74,423
Repurchases During the Nine Months Ended November 30, 2012	2,333
Treasury Stock as of November 30, 2012	$ 76,756
Treasury Stock as of February 29, 2012	$ 8.71
Repurchases During the Nine Months Ended November 30, 2012	$ 8.23
Treasury Stock as of November 30, 2012	$ 8.70