Accumulated Other Comprehensive Loss (Details) $ in Thousands	9 Months Ended
	Aug. 31, 2015 USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2014	$ (13,726)
Other comprehensive loss before reclassifications, net of tax	(8,463)
Balance, August 31, 2015	(22,189)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2014	(13,733)
Other comprehensive loss before reclassifications, net of tax	(8,411)
Balance, August 31, 2015	(22,144)
Unrealized Gains (Losses) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2014	7
Other comprehensive loss before reclassifications, net of tax	(52)
Balance, August 31, 2015	$ (45)