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Revision to Financial Statements - Additional Information (Detail) (USD $)				9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Jan. 01, 2011 Revision [Member]	Sep. 30, 2012 Revision [Member] CIBC World Markets Corp [Member]
Reestablish book basis of goodwill	$ 137,889,000	$ 137,889,000		$ 5,400,000
Establishment of a reserve				3,000,000
Current and deferred tax items				2,800,000
Retained earnings			$ 9,800,000

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