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Significant Accounting Policies - Net Trading Revenue Including Dividend Income and Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accounting Policies [Abstract]
Dividend Income	$ 6,713	$ 7,311	$ 12,957	$ 14,271
Dividend Expense	$ (5,226)	$ (7,143)	$ (9,467)	$ (12,710)

- Definition

Equity impact of cash dividends declared by an entity during the period for all classes of stock (common, preferred, etc.). This element includes paid and unpaid dividends declared during the period.

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