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Supplemental Guarantor Condensed Consolidated Financial Statements - Condensed Consolidating Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
REVENUES |  |  |  |
Commissions | $ 124,440 | $ 112,429 | $ 244,020 | $ 238,063
Principal transactions, net | 7,532 | 13,460 | 23,249 | 26,015
Interest | 13,106 | 14,246 | 25,477 | 27,639
Investment banking | 22,567 | 24,971 | 41,015 | 45,058
Advisory fees | 60,580 | 53,704 | 117,300 | 103,781
Other | 15,605 | 14,335 | 31,915 | 30,803
Total revenue | 243,830 | 233,145 | 482,976 | 471,359
EXPENSES |  |  |  |
Compensation and related expenses | 160,006 | 150,896 | 319,215 | 309,547
Clearing and exchange fees | 6,293 | 5,989 | 12,335 | 12,020
Communications and technology | 16,018 | 15,328 | 31,882 | 31,466
Occupancy and equipment costs | 17,141 | 17,409 | 34,706 | 41,753
Interest | 7,143 | 8,230 | 14,005 | 17,022
Other | 31,555 | 27,454 | 58,446 | 58,201
Total expenses | 238,156 | 225,306 | 470,589 | 470,009
Income (loss) before income taxes | 5,674 | 7,839 | 12,387 | 1,350
Income tax provision (benefit) | 2,608 | 4,464 | 5,428 | 1,858
Net income (loss) for the period | 3,066 | 3,375 | 6,959 | (508)
Less net income attributable to non-controlling interest, net of tax | 218 | 953 | 448 | 1,727
Net income (loss) attributable to Oppenheimer Holdings Inc. | 2,848 | 2,422 | 6,511 | (2,235)
Comprehensive income (loss) | 49 | (288) | 500 | (654)
Parent [Member] |  |  |  |
REVENUES |  |  |  |
Interest |  |  | 5 |
Total revenue |  |  | 5 |
EXPENSES |  |  |  |
Compensation and related expenses | 254 | 84 | 695 | 212
Communications and technology | 35 | 44 | 58 | 44
Interest | 4,375 | 4,376 | 8,750 | 8,750
Other | 323 | 429 | 760 | 772
Total expenses | 4,987 | 4,933 | 10,263 | 9,778
Income (loss) before income taxes | (4,987) | (4,933) | (10,258) | (9,778)
Income tax provision (benefit) | (1,899) | (2,078) | (3,931) | (3,910)
Net income (loss) for the period | (3,088) | (2,855) | (6,327) | (5,868)
Equity in subsidiaries | 5,936 | 5,277 | 12,838 | 3,633
Net income (loss) attributable to Oppenheimer Holdings Inc. | 2,848 | 2,422 | 6,511 | (2,235)
Comprehensive income (loss) | (3) | (3) | (3) | (1)
Guarantor Subsidiaries [Member] |  |  |  |
REVENUES |  |  |  |
Principal transactions, net | (61) | (198) | 12 | 290
Interest | 2,805 | 3,057 | 5,593 | 6,154
Other | 42 | 42 | 84 | 84
Total revenue | 2,786 | 2,901 | 5,689 | 6,528
EXPENSES |  |  |  |
Interest |  | 1 |  | 20
Other | 16 | 19 | 19 | 37
Total expenses | 16 | 20 | 19 | 57
Income (loss) before income taxes | 2,770 | 2,881 | 5,670 | 6,471
Income tax provision (benefit) | 1,215 | 3,034 | 1,894 | 4,286
Net income (loss) for the period | 1,555 | (153) | 3,776 | 2,185
Net income (loss) attributable to Oppenheimer Holdings Inc. | 1,555 | (153) | 3,776 | 2,185
Non-Guarantor Subsidiaries [Member] |  |  |  |
REVENUES |  |  |  |
Commissions | 124,440 | 112,429 | 244,020 | 238,063
Principal transactions, net | 7,593 | 13,658 | 23,237 | 25,725
Interest | 13,018 | 14,820 | 25,314 | 27,816
Investment banking | 22,567 | 24,971 | 41,015 | 45,058
Advisory fees | 61,127 | 54,324 | 118,487 | 105,038
Other | 15,605 | 14,335 | 31,915 | 30,803
Total revenue | 244,350 | 234,537 | 483,988 | 472,503
EXPENSES |  |  |  |
Compensation and related expenses | 159,752 | 150,812 | 318,520 | 309,335
Clearing and exchange fees | 6,293 | 5,989 | 12,335 | 12,020
Communications and technology | 15,983 | 15,284 | 31,824 | 31,422
Occupancy and equipment costs | 17,183 | 17,451 | 34,790 | 41,837
Interest | 5,485 | 7,484 | 10,690 | 14,583
Other | 31,763 | 27,626 | 58,854 | 58,649
Total expenses | 236,459 | 224,646 | 467,013 | 467,846
Income (loss) before income taxes | 7,891 | 9,891 | 16,975 | 4,657
Income tax provision (benefit) | 3,292 | 3,508 | 7,465 | 1,482
Net income (loss) for the period | 4,599 | 6,383 | 9,510 | 3,175
Less net income attributable to non-controlling interest, net of tax | 218 | 953 | 448 | 1,727
Net income (loss) attributable to Oppenheimer Holdings Inc. | 4,381 | 5,430 | 9,062 | 1,448
Comprehensive income (loss) | 52 | (285) | 503 | (653)
Eliminations [Member] |  |  |  |
REVENUES |  |  |  |
Interest | (2,717) | (3,631) | (5,435) | (6,331)
Advisory fees | (547) | (620) | (1,187) | (1,257)
Other | (42) | (42) | (84) | (84)
Total revenue | (3,306) | (4,293) | (6,706) | (7,672)
EXPENSES |  |  |  |
Occupancy and equipment costs | (42) | (42) | (84) | (84)
Interest | (2,717) | (3,631) | (5,435) | (6,331)
Other | (547) | (620) | (1,187) | (1,257)
Total expenses | (3,306) | (4,293) | (6,706) | (7,672)
Equity in subsidiaries | (5,936) | (5,277) | (12,838) | (3,633)
Net income (loss) attributable to Oppenheimer Holdings Inc. | $ (5,936) | $ (5,277) | $ (12,838) | $ (3,633)

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