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Fair Value Measurements - Securities Owned and Securities Sold, But Not Yet Purchased at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	$ 856,088	$ 759,742
Securities Sold	76,314	173,450
U.S. Government, Agency and Sovereign Obligations [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	596,114	525,255
Securities Sold	11,889	131,930
Corporate Debt and Other Obligations [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	14,673	14,428
Securities Sold	4,847	1,858
Mortgage and Other Asset-Backed Securities [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	3,395	2,920
Securities Sold	7	18
Municipal Obligations [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	40,166	49,855
Securities Sold	72	467
Convertible Bonds [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	53,719	49,130
Securities Sold	13,922	8,868
Corporate Equities [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	61,634	43,708
Securities Sold	45,336	29,884
Money Markets [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	1,263	2,328
Securities Sold	241	325
Auction Rate Securities [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	85,124	72,118
Securities Sold		$ 100