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Earnings Per Share - Summary of Earnings Per Share (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Warrants expire date	2013-04-13
Class A Stock [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Number of anti-dilutive warrants, options and restricted shares, for the year	57,573	1,936,871	1,142,028
CIBC World Markets Corp. [Member] | January 2008 Acquisition [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Period for exercise of warrant	5 years
Acquisition date of CIBC World Markets Corp.	Jan. 14, 2008
Warrants expire date	2013-04-13
CIBC World Markets Corp. [Member] | January 2008 Acquisition [Member] | Class A Stock [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Company issued a warrant to purchase share of Class A Stock	1,000,000
Class A Stock exercisable	48.62

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