Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Nov. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 795,513	$ 298,987
Expenses	671,314	548,863
Segment assets	37,703,367		$ 36,941,276
Capital Markets [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	782,600	263,300
Expenses	656,700	533,100
Segment assets	36,856,200		35,931,800
Asset management [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	12,900	35,700
Expenses	14,600	$ 15,800
Segment assets	$ 847,200		$ 1,009,500