Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	May. 31, 2015	Nov. 30, 2014
Finite And Infinite Lived Intangible Assets [Line Items]
Total gross costs - intangible assets	$ 273,979	$ 274,860
Accumulated amortization - finite lived intangible assets	(39,073)	(33,079)
Total net carrying amount - intangible assets	234,906	241,781
Customer relationships [Member]
Finite And Infinite Lived Intangible Assets [Line Items]
Gross costs - finite lived intangible assets	127,944	128,323
Accumulated amortization - finite lived intangible assets	(30,614)	(26,402)
Net carrying amount - finite lived intangible assets	$ 97,330	$ 101,921
Weighted average remaining lives (years)	13 years 3 months 24 days	13 years 8 months 12 days
Trade name [Member]
Finite And Infinite Lived Intangible Assets [Line Items]
Gross costs - finite lived intangible assets	$ 131,587	$ 132,009
Accumulated amortization - finite lived intangible assets	(8,459)	(6,677)
Net carrying amount - finite lived intangible assets	$ 123,128	$ 125,332
Weighted average remaining lives (years)	32 years 9 months 13 days	33 years 3 months 18 days
Exchange and clearing organization membership interests and registrations [Member]
Finite And Infinite Lived Intangible Assets [Line Items]
Gross costs - indefinite lived intangible assets	$ 14,448	$ 14,528
Accumulated amortization - finite lived intangible assets	0	0
Net carrying amount - indefinite lived intangible assets	$ 14,448	$ 14,528