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Earnings per share - Summary of Earnings Per Share (Parenthetical) (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |
Warrants expire date | 2013-04-13 |  |
Number of antidilutive warrants, options and restricted shares, for the year | 1,936,871 | 1,142,028 | 1,254,279
CIBC World Markets Corp. [Member] |  |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |
Acquisition date of CIBC World Markets Corp. | Jan. 14, 2008 |  |
Warrants expire date | 2013-04-13 |  |
Class A Stock [Member] | CIBC World Markets Corp. [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 |  |
Period for exercise of warrant | 5 years |  |

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