Goodwill and Intangible Assets - Schedule of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2017	Nov. 30, 2016
Goodwill [Roll Forward]
Balance, at beginning of period	$ 1,640,653	$ 1,656,588
Translation adjustments	6,436	(15,935)
Balance, at end of period	1,647,089	1,640,653
Capital Markets
Goodwill [Roll Forward]
Balance, at beginning of period	1,637,653
Balance, at end of period	1,644,089	1,637,653
Accumulated goodwill impairments	51,900	51,900
Goodwill, gross	1,696,000	1,689,600
Asset management
Goodwill [Roll Forward]
Balance, at beginning of period	3,000
Balance, at end of period	3,000	3,000
Accumulated goodwill impairments	2,100	2,100
Goodwill, gross	$ 5,100	$ 5,100