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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
REVENUES |  |  |  |
Commissions | $ 120,252 | $ 113,424 | $ 364,272 | $ 351,487
Principal transactions, net | 10,347 | 14,372 | 33,596 | 40,387
Interest | 14,439 | 14,823 | 39,916 | 42,462
Investment banking | 21,362 | 21,589 | 62,377 | 66,647
Advisory fees | 60,117 | 53,015 | 177,417 | 156,796
Other | 16,859 | 14,615 | 48,774 | 45,418
Total revenue | 243,376 | 231,838 | 726,352 | 703,197
EXPENSES |  |  |  |
Compensation and related expenses | 161,081 | 151,969 | 480,296 | 461,516
Clearing and exchange fees | 6,099 | 6,026 | 18,434 | 18,046
Communications and technology | 16,999 | 15,880 | 48,881 | 47,346
Occupancy and equipment costs | 16,405 | 17,526 | 51,111 | 59,279
Interest | 6,164 | 8,842 | 20,169 | 25,864
Other | 28,465 | 26,337 | 86,911 | 84,538
Total expenses | 235,213 | 226,580 | 705,802 | 696,589
Income (loss) before income taxes | 8,163 | 5,258 | 20,550 | 6,608
Income tax provision (benefit) | 2,655 | 2,234 | 8,083 | 4,092
Net income (loss) for the period | 5,508 | 3,024 | 12,467 | 2,516
Less net income attributable to non-controlling interest, net of tax | 271 | 702 | 719 | 2,429
Net income attributable to Oppenheimer Holdings Inc. | 5,237 | 2,322 | 11,748 | 87
Comprehensive income (loss) | 656 | 180 | 1,156 | (474)
Parent [Member] |  |  |  |
REVENUES |  |  |  |
Interest |  |  | 5 |
Total revenue |  |  | 5 |
EXPENSES |  |  |  |
Compensation and related expenses | 207 | 123 | 902 | 335
Communications and technology | 23 | 13 | 81 | 57
Interest | 4,375 | 4,375 | 13,125 | 13,125
Other | 285 | 367 | 1,045 | 1,139
Total expenses | 4,890 | 4,878 | 15,153 | 14,656
Income (loss) before income taxes | (4,890) | (4,878) | (15,148) | (14,656)
Income tax provision (benefit) | (1,792) | (1,720) | (5,723) | (5,630)
Net income (loss) for the period | (3,098) | (3,158) | (9,425) | (9,026)
Equity in subsidiaries | 8,335 | 5,480 | 21,173 | 9,113
Net income attributable to Oppenheimer Holdings Inc. | 5,237 | 2,322 | 11,748 | 87
Comprehensive income (loss) |  |  | (3) | 1
Guarantor Subsidiaries [Member] |  |  |  |
REVENUES |  |  |  |
Principal transactions, net | 26 | 438 | 38 | 728
Interest | 2,777 | 3,049 | 8,370 | 9,203
Other | 42 | 42 | 126 | 126
Total revenue | 2,845 | 3,529 | 8,534 | 10,057
EXPENSES |  |  |  |
Interest |  | (20) |  |
Other | 4 | 18 | 23 | 55
Total expenses | 4 | (2) | 23 | 55
Income (loss) before income taxes | 2,841 | 3,531 | 8,511 | 10,002
Income tax provision (benefit) | 1,808 | 1,277 | 3,702 | 5,563
Net income (loss) for the period | 1,033 | 2,254 | 4,809 | 4,439
Net income attributable to Oppenheimer Holdings Inc. | 1,033 | 2,254 | 4,809 | 4,439
Non-Guarantor Subsidiaries [Member] |  |  |  |
REVENUES |  |  |  |
Commissions | 120,252 | 113,424 | 364,272 | 351,487
Principal transactions, net | 10,321 | 13,934 | 33,558 | 39,659
Interest | 14,805 | 14,554 | 40,119 | 42,370
Investment banking | 21,362 | 21,589 | 62,377 | 66,647
Advisory fees | 60,650 | 53,645 | 179,137 | 158,683
Other | 16,859 | 14,617 | 48,774 | 45,420
Total revenue | 244,249 | 231,763 | 728,237 | 704,266
EXPENSES |  |  |  |
Compensation and related expenses | 160,874 | 151,846 | 479,394 | 461,181
Clearing and exchange fees | 6,099 | 6,026 | 18,434 | 18,046
Communications and technology | 16,976 | 15,867 | 48,800 | 47,289
Occupancy and equipment costs | 16,447 | 17,568 | 51,237 | 59,405
Interest | 4,932 | 7,268 | 15,622 | 21,851
Other | 28,709 | 26,583 | 87,563 | 85,232
Total expenses | 234,037 | 225,158 | 701,050 | 693,004
Income (loss) before income taxes | 10,212 | 6,605 | 27,187 | 11,262
Income tax provision (benefit) | 2,639 | 2,677 | 10,104 | 4,159
Net income (loss) for the period | 7,573 | 3,928 | 17,083 | 7,103
Less net income attributable to non-controlling interest, net of tax | 271 | 702 | 719 | 2,429
Net income attributable to Oppenheimer Holdings Inc. | 7,302 | 3,226 | 16,364 | 4,674
Comprehensive income (loss) | 656 | 180 | 1,159 | (475)
Eliminations [Member] |  |  |  |
REVENUES |  |  |  |
Interest | (3,143) | (2,780) | (8,578) | (9,111)
Advisory fees | (533) | (630) | (1,720) | (1,887)
Other | (42) | (44) | (126) | (128)
Total revenue | (3,718) | (3,454) | (10,424) | (11,126)
EXPENSES |  |  |  |
Occupancy and equipment costs | (42) | (42) | (126) | (126)
Interest | (3,143) | (2,781) | (8,578) | (9,112)
Other | (533) | (631) | (1,720) | (1,888)
Total expenses | (3,718) | (3,454) | (10,424) | (11,126)
Equity in subsidiaries | (8,335) | (5,480) | (21,173) | (9,113)
Net income attributable to Oppenheimer Holdings Inc. | $ (8,335) | $ (5,480) | $ (21,173) | $ (9,113)

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