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Earnings Per Share - Summary of Earnings Per Share (Parenthetical) (Detail) (USD $) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 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 | 57,573 | 1,059,638 | 57,573 | 1,059,638
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 |  | 1,000,000 |
Class A Stock exercisable |  |  | $ 48.62 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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