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Goodwill - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended				3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 JVB Holdings [Member]	Jun. 30, 2012 PrinceRidge [Member]	Sep. 30, 2010 Cira SCM [Member]
Goodwill [Line Items]
Impairment charge	$ 0	$ 0	$ 5,607			$ 5,607
Measurement period adjustment				$ 30	$ (93)

X

- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.

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X

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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