Accumulated Other Comprehensive Loss (Details) $ in Thousands	6 Months Ended
	May. 31, 2015 USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2014	$ (13,726)
Other comprehensive (loss) income before reclassifications, net of tax	(8,189)
Balance, May 31, 2015	(21,915)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2014	(13,733)
Other comprehensive (loss) income before reclassifications, net of tax	(8,154)
Balance, May 31, 2015	(21,887)
Unrealized Gains (Losses) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2014	7
Other comprehensive (loss) income before reclassifications, net of tax	(35)
Balance, May 31, 2015	$ (28)