Exit Costs - Restructuring and Impairment Costs (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Aug. 31, 2016	Aug. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	$ 0	$ 1,854
Compensation and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	0	320
Technology and communications
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	0	1,234
Other expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	0	300
Severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	0	279
Accelerated amortization of restricted stock and restricted cash awards
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	0	41
Contract termination costs
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	0	1,234
Other expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs	$ 0	$ 300