Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	May. 31, 2015	Nov. 30, 2014
Cash and cash equivalents ($192 and $178 at May 31, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	$ 3,288,758	$ 4,079,968
Financial instruments owned, at fair value, (including securities pledged of $15,384,622 and $14,794,488 at May 31, 2015 and November 30, 2014, respectively; and $54,999 and $62,990 at May 31, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	15,384,622	14,794,488
Financial instruments owned, at fair value, (including securities pledged of $15,384,622 and $14,794,488 at May 31, 2015 and November 30, 2014, respectively; and $54,999 and $62,990 at May 31, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	18,843,199	18,636,612
Fees, interest and other ($333 and $363 at May 31, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	402,276	262,437
Other secured financings ($705,653 and $597,999 at May 31, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	709,567	605,824
Accrued expenses and other liabilities ($861 and $589 at May 31, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	1,121,413	1,273,378
Variable Interest Entities [Member]
Cash and cash equivalents ($192 and $178 at May 31, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	192	178
Financial instruments owned, at fair value, (including securities pledged of $15,384,622 and $14,794,488 at May 31, 2015 and November 30, 2014, respectively; and $54,999 and $62,990 at May 31, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	54,999	62,990
Fees, interest and other ($333 and $363 at May 31, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	333	363
Other secured financings ($705,653 and $597,999 at May 31, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	705,653	597,999
Accrued expenses and other liabilities ($861 and $589 at May 31, 2015 and November 30, 2014, respectively, related to consolidated VIEs)	$ 861	$ 589