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Earnings Per Share - Earnings per share (Parenthetical) (Detail) (USD $)	9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012 CIBC World Markets Corp [Member] January 2008 Acquisition [Member]	Sep. 30, 2012 Common Stock Class A Non Voting [Member] CIBC World Markets Corp [Member] January 2008 Acquisition [Member]	Sep. 30, 2012 Common Stock Class A Non Voting [Member] Stock Compensation Plan [Member]	Sep. 30, 2012 Common Stock Class A Non Voting [Member] Stock Compensation Plan [Member]	Sep. 30, 2011 Common Stock Class A Non Voting [Member] Warrant [Member]	Sep. 30, 2011 Common Stock Class A Non Voting [Member] Warrant [Member]
Earnings Loss Per Share [Line Items]
Company issued a warrant to purchase share of Class A Stock		1,000,000
Class A Stock exercisable		$ 48.62
Period for exercise of warrant	5 years
Acquisition date of CIBC Worlds Market Corp	Jan. 14, 2008
Number of anti-dilutive share which is not included in computations of diluted profit			1,059,638	1,059,638	1,139,695	1,142,028

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