Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
May 31, 2016 |
May 31, 2015 |
May 31, 2016 |
May 31, 2015 |
Nov. 30, 2015 |
|
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Net revenues | $ 719,408 | $ 791,554 | $ 1,018,395 | $ 1,383,226 | |
| Expenses | 616,811 | 706,842 | 1,165,674 | 1,285,630 | |
| Segment assets | 37,120,029 | 37,120,029 | $ 38,563,972 | ||
| Capital Markets [Member] | |||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Net revenues | 696,500 | 789,100 | 959,800 | 1,351,500 | |
| Expenses | 602,300 | 692,400 | 1,135,400 | 1,264,700 | |
| Segment assets | 36,241,700 | 36,241,700 | 37,804,900 | ||
| Asset management [Member] | |||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Net revenues | 22,900 | 2,500 | 58,600 | 31,700 | |
| Expenses | 14,500 | $ 14,400 | 30,300 | $ 20,900 | |
| Segment assets | $ 878,300 | $ 878,300 | $ 759,000 | ||