Incentive Plans - Summary of Impact of Share-Based Incentive Plans on Compensation and Benefits Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based incentive awards:
Share-based incentive awards	$ 235,898	$ 310,348	$ 275,142
RSUs [Member]
Share-based incentive awards:
Share-based incentive awards	209,974	298,809	264,110
PRSUs [Member]
Share-based incentive awards:
Share-based incentive awards	12,934
Restricted Stock [Member]
Share-based incentive awards:
Share-based incentive awards	11,374	10,003	9,767
DSUs [Member]
Share-based incentive awards:
Share-based incentive awards	$ 1,616	$ 1,536	$ 1,265