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Supplemental Guarantor Condensed Consolidated Financial Statements - Condensed Consolidated Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
REVENUES |  |
Commissions | $ 119,580 | $ 125,634
Principal transactions, net | 15,717 | 12,555
Interest | 12,371 | 13,393
Investment banking | 18,448 | 20,087
Advisory fees | 56,720 | 50,077
Other | 16,310 | 16,468
Total revenue | 239,146 | 238,214
EXPENSES |  |
Compensation and related expenses | 159,209 | 158,651
Clearing and exchange fees | 6,042 | 6,031
Communications and technology | 15,864 | 16,138
Occupancy and equipment costs | 17,565 | 24,344
Interest | 6,862 | 8,792
Other | 26,891 | 30,747
Total expenses | 232,433 | 244,703
Income (loss) before income taxes | 6,713 | (6,489)
Income tax provision (benefit) | 2,820 | (2,606)
Net income (loss) for the period | 3,893 | (3,883)
Less net income attributable to non- controlling interest, net of tax | 230 | 774
Net income (loss) attributable to Oppenheimer Holdings Inc. | 3,663 | (4,657)
Comprehensive income | 451 | (366)
Parent [Member] |  |
REVENUES |  |
Interest | 5 |
Total revenue | 5 |
EXPENSES |  |
Compensation and related expenses | 441 | 128
Communications and technology | 23 |
Interest | 4,375 | 4,374
Other | 437 | 343
Total expenses | 5,276 | 4,845
Income (loss) before income taxes | (5,271) | (4,845)
Income tax provision (benefit) | (2,032) | (1,832)
Net income (loss) for the period | (3,239) | (3,013)
Equity in subsidiaries | 6,902 | (1,644)
Net income (loss) attributable to Oppenheimer Holdings Inc. | 3,663 | (4,657)
Comprehensive income |  | 2
Guarantor subsidiaries [Member] |  |
REVENUES |  |
Principal transactions, net | 73 | 488
Interest | 2,788 | 3,097
Other | 42 |
Total revenue | 2,903 | 3,585
EXPENSES |  |
Occupancy and equipment costs |  | (42)
Interest |  | 66
Other | 3 | 18
Total expenses | 3 | 42
Income (loss) before income taxes | 2,900 | 3,543
Income tax provision (benefit) | 679 | 1,233
Net income (loss) for the period | 2,221 | 2,310
Net income (loss) attributable to Oppenheimer Holdings Inc. | 2,221 | 2,310
Non-guarantor Subsidiaries [Member] |  |
REVENUES |  |
Commissions | 119,580 | 125,634
Principal transactions, net | 15,644 | 12,067
Interest | 12,296 | 12,996
Investment banking | 18,448 | 20,087
Advisory fees | 57,360 | 50,714
Other | 16,310 | 16,468
Total revenue | 239,638 | 237,966
EXPENSES |  |
Compensation and related expenses | 158,768 | 158,523
Clearing and exchange fees | 6,042 | 6,031
Communications and technology | 15,841 | 16,138
Occupancy and equipment costs | 17,607 | 24,386
Interest | 5,205 | 7,052
Other | 27,091 | 31,023
Total expenses | 230,554 | 243,153
Income (loss) before income taxes | 9,084 | (5,187)
Income tax provision (benefit) | 4,173 | (2,007)
Net income (loss) for the period | 4,911 | (3,180)
Less net income attributable to non- controlling interest, net of tax | 230 | 774
Net income (loss) attributable to Oppenheimer Holdings Inc. | 4,681 | (3,954)
Comprehensive income | 451 | (368)
Eliminations [Member] |  |
REVENUES |  |
Interest | (2,718) | (2,700)
Advisory fees | (640) | (637)
Other | (42) |
Total revenue | (3,400) | (3,337)
EXPENSES |  |
Occupancy and equipment costs | (42) |
Interest | (2,718) | (2,700)
Other | (640) | (637)
Total expenses | (3,400) | (3,337)
Equity in subsidiaries | (6,902) | 1,644
Net income (loss) attributable to Oppenheimer Holdings Inc. | $ (6,902) | $ 1,644

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