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Earnings per share - Summary of Earnings Per Share (Parenthetical) (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Class A Stock [Member] |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |
Number of antidilutive warrants, options and restricted shares, for the year | 1,057,573 | 1,058,048
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] | Class A Stock [Member] | January 2008 Acquisition [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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