Collateralized Transactions - Summary of Repurchase Agreements and Securities Borrowing and Lending Arrangements (Detail) - USD ($) $ in Thousands	Aug. 31, 2015	Nov. 30, 2014
Banking and Thrift [Abstract]
Securities borrowing arrangements, Gross amounts	$ 7,702,853	$ 6,853,103
Securities borrowing arrangements, Netting in consolidated statement of financial condition	0	0
Securities borrowing arrangements, Net amounts in consolidated statement of financial condition	7,702,853	6,853,103
Securities borrowing arrangements, Additional amounts available for setoff	(624,220)	(680,222)
Securities borrowing arrangements, Available collateral	(776,755)	(1,274,196)
Securities borrowing arrangements, Net amount	6,301,878	4,898,685
Reverse repurchase agreements, Gross amounts	12,911,367	14,059,133
Reverse repurchase agreements, Netting in consolidated statement of financial condition	(8,637,685)	(10,132,275)
Reverse repurchase agreements, Net amounts in consolidated statement of financial condition	4,273,682	3,926,858
Reverse repurchase agreements, Additional amounts available for setoff	(111,791)	(634,568)
Reverse repurchase agreements, Available collateral	(4,153,574)	(3,248,817)
Reverse repurchase agreements, Net amount	8,317	43,473
Securities lending arrangements, Gross amounts	3,645,195	2,598,487
Securities lending arrangements, Netting in consolidated statement of financial condition	0	0
Securities loaned	3,645,195	2,598,487
Securities lending arrangements, Additional amounts available for setoff	(624,220)	(680,222)
Securities lending arrangements, Available collateral	(2,985,739)	(1,883,140)
Securities lending arrangements, Net amount	35,236	35,125
Repurchase agreements, Gross amounts	19,478,562	20,804,432
Repurchase agreements, Netting in consolidated statement of financial condition	(8,637,685)	(10,132,275)
Securities sold under agreements to repurchase	10,840,877	10,672,157
Repurchase agreements, Additional amounts available for setoff	(111,791)	(634,568)
Repurchase agreements, Available collateral	(9,263,393)	(8,810,770)
Repurchase agreements, Net amount	$ 1,465,693	$ 1,226,819