Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2016	Nov. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Total gross costs - intangible assets	$ 266,786	$ 266,786	$ 270,852
Accumulated amortization - finite lived intangible assets	(53,337)	(53,337)	(45,069)
Disposals - indefinite lived intangible assets	(1,379)	(1,379)
Impairment of intangible assets	1,300	1,284
Total net carrying amount - intangible assets	210,786	210,786	225,783
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross costs - finite lived intangible assets	126,081	126,081	127,667
Accumulated amortization - finite lived intangible assets	(40,453)	(40,453)	(34,754)
Net carrying amount - finite lived intangible assets	85,628	$ 85,628	$ 92,913
Weighted average remaining lives (years)		12 years 4 months	12 years 10 months 23 days
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross costs - finite lived intangible assets	128,845	$ 128,845	$ 131,288
Accumulated amortization - finite lived intangible assets	(12,884)	(12,884)	(10,315)
Net carrying amount - finite lived intangible assets	115,961	$ 115,961	$ 120,973
Weighted average remaining lives (years)		31 years 6 months	32 years 3 months 18 days
Exchange and Clearing Organization Membership Interests and Registrations [Member]
Finite-Lived Intangible Assets [Line Items]
Gross costs - indefinite lived intangible assets	11,860	$ 11,860	$ 11,897
Accumulated amortization - finite lived intangible assets			0
Disposals - indefinite lived intangible assets	(1,379)	(1,379)
Impairment of intangible assets		1,284
Net carrying amount - indefinite lived intangible assets	$ 9,197	$ 9,197	$ 11,897