Declared and Paid Dividends (Detail) (USD $)	3 Months Ended
	May 31, 2012 Dividend Payment 1st	May 31, 2013 Dividend Payment 2nd
Dividends Payable [Line Items]
Date Declared	May 23, 2012	Jun. 04, 2013
Date Paid	Jun. 15, 2012	Jun. 17, 2013
Dividend Amount	$ 0.10	$ 0.05