Benefit Plans - Components of Net Periodic Pension (Benefit) Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2015	Aug. 31, 2014
U.S Pension Plan [Member]
Components of net periodic pension (income) cost:
Service cost	$ 63	$ 56	$ 189	$ 168
Interest cost on projected benefit obligation	585	607	1,755	1,821
Expected return on plan assets	(848)	(789)	(2,544)	(2,367)
Net amortization	0	(36)	0	(108)
Net periodic pension income	(200)	(162)	(600)	(486)
German Pension Plan [Member]
Components of net periodic pension (income) cost:
Service cost	0	11	0	33
Interest cost on projected benefit obligation	132	216	395	658
Net amortization	82	61	245	186
Net periodic pension income	$ 214	$ 288	$ 640	$ 877