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Acquisitions (Results of Operations on Acquisition Included Consolidated Financial Statements) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net loss		$ (66,809)	$ 39,770
Diluted	$ 1.33	$ 0.03	$ 1.56
Thomas Weisel Partners Group Inc [Member]
Total net revenues		$ 1,472,905	$ 1,286,664
Basic		$ (1.38)	$ 0.82
Diluted		$ (1.38)	$ 0.69

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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