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Earnings per share | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Abstract] |
Earnings per share | 3. Earnings per share Basic earnings per share was computed by dividing net income attributable to Oppenheimer Holdings Inc. by the weighted average number of shares of Class A non-voting common stock (“Class A Stock”) and Class B voting common stock (“Class B Stock”) Stock outstanding. Diluted earnings per share includes the weighted average number of shares of Class A and Class B Stock outstanding and the effects of the warrants using the treasury method and options to purchase the Class A Stock and restricted stock awards of Class A Stock using the treasury stock method. Earnings per share has been calculated as follows:
|  | Three months ended March 31, |
(expressed in thousands of dollars, except share and per share amounts) |  | 2013 |  |  | 2012 |
Basic weighted average number of shares outstanding |  |  | 13,607,998 |  |  |  | 13,597,330 |
Net dilutive effect of warrant, treasury method (1) |  |  | — |  |  |  | — |
Net dilutive effect of share-based awards, treasury method (2) |  |  | 420,717 |  |  |  | — |
Diluted weighted average number of shares outstanding |  |  | 14,028,715 |  |  |  | 13,597,330 |
Net income (loss) for the period |  | $ | 3,893 |  |  | $ | (3,883 | )
Net income attributable to non-controlling interest, net of tax |  |  | 230 |  |  |  | 774 |
Net income (loss) attributable to Oppenheimer Holdings Inc. |  | $ | 3,663 |  |  | $ | (4,657 | )
Basic profit (loss) per share |  | $ | 0.27 |  |  | $ | (0.34 | )
Diluted profit (loss) per share |  | $ | 0.26 |  |  | $ | (0.34 | )
(1) | As part of the consideration for the 2008 acquisition of certain businesses from CIBC World Markets Corp., the Company issued a warrant to CIBC to purchase 1 million shares of Class A Stock of the Company at $48.62 per share exercisable five years from the January 14, 2008 acquisition date. The warrants expire on April 13, 2013. For the three months ended March 31, 2013 and 2012, the effect of the warrants is anti-dilutive.
(2) | For the three months ended March 31, 2013, the diluted earnings per share computation does not include the anti-dilutive effect of 1,057,573 shares of Class A Stock granted under share-based compensation arrangements together with the warrant described in (1) above (1,058,048 shares for the three months ended March 31, 2012).

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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