Long-Term Debt - Additional Information (Detail) - USD ($)	3 Months Ended
	May. 31, 2015	Feb. 28, 2015	May. 31, 2014	Sep. 19, 2013
Line of Credit Facility [Line Items]
Revolving credit facility, outstanding borrowings	$ 85,500,000	$ 106,500,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, outstanding borrowings	$ 85,500,000	$ 106,500,000
Revolving credit facility, percentage of capital securities of direct foreign subsidiary	65.00%
Third Amendment [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, initiation date	Sep. 19, 2013
Minimum tangible net worth, amount				$ 100,000,000
Minimum tangible net worth percentage				25.00%
Third Amendment [Member] | Standby letters of credit [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, outstanding borrowings	$ 2,800,000
Revolving credit facility, remaining borrowing capacity	61,700,000
Second Amendment [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, maximum borrowing capacity	150,000,000
Revolving credit facility, additional borrowing capacity	$ 200,000,000
Revolving credit facility, maturity date	Aug. 18, 2016
Revolving credit facility, interest rate description	London Interbank Offered Rate ("LIBOR") plus a spread ranging from 1.0% to 2.25%
Revolving credit facility, interest rate variable basis spread, option one	1.50%		1.65%
Revolving credit facility, interest rate variable basis spread, option two	1.75%
Second Amendment [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, variable basis spread	1.00%
Second Amendment [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, variable basis spread	2.25%