Benefit Plans - Net Periodic Pension Cost (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Feb. 28, 2013	Feb. 29, 2012
U.S. Pension Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	$ 56	$ 44
Interest cost on projected benefit obligation	529	584
Expected return on plan assets	(665)	(616)
Net amortization	300	317
Net periodic pension cost	220	329
German Pension Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Service cost	16	9
Interest cost on projected benefit obligation	217	267
Net periodic pension cost	$ 233	$ 276