Collateralized Transactions - Additional Information (Detail) - USD ($) $ in Thousands |
May 31, 2016 |
Nov. 30, 2015 |
|---|---|---|
| Banking and Thrift [Abstract] | ||
| Fair value of securities received as collateral | $ 24,700,000 | $ 26,200,000 |
| Cash and securities segregated and on deposit for regulatory purposes or deposited with clearing and depository organizations | $ 836,871 | $ 751,084 |