Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) (USD $)	3 Months Ended	12 Months Ended
	May 31, 2012	Nov. 30, 2013 Successor [Member]	Nov. 30, 2013 Successor [Member] Exchange and clearing organization membership interests and registrations [Member]	Nov. 30, 2013 Successor [Member] Customer relationships [Member]	Nov. 30, 2013 Successor [Member] Trade names [Member]	Nov. 30, 2012 Predecessor [Member]	Nov. 30, 2012 Predecessor [Member] Exchange and clearing organization membership interests and registrations [Member]	Nov. 30, 2012 Predecessor [Member] Customer relationships [Member]	Nov. 30, 2012 Predecessor [Member] Trade names [Member]	Nov. 30, 2012 Predecessor [Member] Other intangible assets [Member]
Gross costs - finite lived intangible assets				$ 136,740,000	$ 132,967,000			$ 10,542,000	$ 1,680,000	$ 100,000
Impairment losses	(2,900,000)	(378,000)	(378,000)			(2,873,000)	(2,873,000)
Accumulated amortization - finite lived intangible assets		(20,533,000)		(17,567,000)	(2,966,000)	(5,409,000)		(4,107,000)	(1,287,000)	(15,000)
Net carrying amount - finite lived intangible assets				119,173,000	130,001,000			6,435,000	393,000	85,000
Weighted average remaining lives (years)				14 years 9 months 18 days	34 years 3 months 18 days			7 years 10 months 24 days	3 years 6 months	12 years 9 months 18 days
Gross costs - indefinite lived intangible assets			15,294,000				11,219,000
Net carrying amount - indefinite lived intangible assets			14,916,000				8,346,000
Total gross costs - intangible assets		285,001,000				23,541,000
Total net carrying amount - intangible assets		$ 264,090,000				$ 15,259,000