Investments - Summary of Selected Financial Information for Jefferies LoanCore (Detail) - Jefferies LoanCore, LLC [Member] - USD ($) $ in Millions |
May 31, 2016 |
Nov. 30, 2015 |
|---|---|---|
| Schedule of Equity Method Investments [Line Items] | ||
| Total assets | $ 1,215.3 | $ 2,069.1 |
| Total liabilities | 886.1 | 1,469.8 |
| Total equity | 329.2 | 599.3 |
| Our total equity balance | $ 159.7 | $ 290.7 |