Accounts Receivable and Allowance for Doubtful Receivables - Allowance for Doubtful Receivables (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012
Receivables [Abstract]
Balance at beginning of period	$ 3,748	$ 4,410	$ 3,952	$ 4,403
Bad debt expense	618		2,816	287
Recoveries	9	5	28	24
Accounts written off	(484)	(732)	(2,905)	(1,031)
Balance at end of period	$ 3,891	$ 3,683	$ 3,891	$ 3,683