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Condensed Consolidating Financial Information - Condensed Consolidating Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 99,044 | $ 63,364 | $ 47,311 | $ 63,807
Deposits with clearing organizations | 35,614 | 49,490 |  |
Receivable from brokers, dealers and clearing organizations | 255,818 | 365,791 |  |
Receivable from customers, net of allowance | 798,048 | 840,355 |  |
Income tax receivable | 20,065 | 12,231 |  |
Securities purchased under agreements to resell | 0 | 206,499 |  |
Securities owned | 1,027,933 | 734,831 |  |
Notes receivable, net of accumulated amortization and allowance for uncollectibles | 31,120 | 32,849 |  |
Office facilities, net of accumulated depreciation | 28,321 | 28,285 |  |
Assets held for sale | 11,748 | 99,881 |  |
Subordinated loan receivable | 0 | 0 |  |
Intangible assets | 31,700 | 31,700 |  |
Goodwill | 137,889 | 137,889 |  |
Other assets | 106,381 | 94,839 |  |
Deferred tax assets | 0 | 0 |  |
Investment in subsidiaries | 0 | 0 |  |
Intercompany receivables | 0 | 0 |  |
Total assets | 2,583,681 | 2,698,004 |  |
Liabilities |  |  |  |
Drafts payable | 31,414 | 48,011 |  |
Bank call loans | 132,000 | 100,200 |  |
Payable to brokers, dealers and clearing organizations | 154,168 | 164,546 |  |
Payable to customers | 517,681 | 594,833 |  |
Securities sold under agreements to repurchase | 528,113 | 651,445 |  |
Securities sold, but not yet purchased, at fair value | 295,507 | 126,493 |  |
Liabilities held for sale | 20,605 | 74,680 |  |
Accrued compensation | 120,976 | 149,092 |  |
Accounts payable and other liabilities | 105,770 | 108,637 |  |
Income tax payable | 0 | 0 |  |
Senior secured notes | 149,231 | 148,868 |  |
Subordinated indebtedness | 0 | 0 |  |
Deferred tax liabilities | 12,204 | 6,117 |  |
Intercompany payables | 0 | 0 |  |
Total liabilities | 2,067,669 | 2,172,922 |  |
Stockholders' equity |  |  |  |
Stockholders' equity attributable to Oppenheimer Holdings Inc. | 513,496 | 518,058 |  |
Noncontrolling interest | 2,516 | 7,024 |  |
Total stockholders' equity | 516,012 | 525,082 | 529,777 |
Total liabilities and stockholders' equity | 2,583,681 | 2,698,004 |  |
Allowance for credit losses | 2,503 | 2,545 |  |
Amounts pledged | 799,379 | 546,334 |  |
Net accumulated depreciation | 109,278 | 104,812 |  |
Accumulated amortization | 64,763 | 54,919 |  |
Accumulated allowance | 8,037 | 8,444 |  |
Unamortized debt issuance expense | 769 | 1,132 |  |
Deferred tax assets, gross | 62,014 | 63,481 |  |
Eliminations [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Deposits with clearing organizations | 0 | 0 |  |
Receivable from brokers, dealers and clearing organizations | 0 | 0 |  |
Receivable from customers, net of allowance | 0 | 0 |  |
Income tax receivable | (49,177) | (49,106) |  |
Securities purchased under agreements to resell |  | 0 |  |
Securities owned | 0 | 0 |  |
Notes receivable, net of accumulated amortization and allowance for uncollectibles | 0 | 0 |  |
Office facilities, net of accumulated depreciation | 0 | 0 |  |
Assets held for sale | 0 | 0 |  |
Subordinated loan receivable | (112,558) | (112,558) |  |
Intangible assets | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Other assets | 0 | 0 |  |
Deferred tax assets | (38,628) | (41,103) |  |
Investment in subsidiaries | (1,078,736) | (1,109,971) |  |
Intercompany receivables | (74,046) | (73,372) |  |
Total assets | (1,353,145) | (1,386,110) |  |
Liabilities |  |  |  |
Drafts payable | 0 | 0 |  |
Bank call loans | 0 | 0 |  |
Payable to brokers, dealers and clearing organizations | 0 | 0 |  |
Payable to customers | 0 | 0 |  |
Securities sold under agreements to repurchase | 0 | 0 |  |
Securities sold, but not yet purchased, at fair value | 0 | 0 |  |
Liabilities held for sale | 0 | 0 |  |
Accrued compensation | 0 | 0 |  |
Accounts payable and other liabilities | 0 | 0 |  |
Income tax payable | (49,177) | (49,106) |  |
Senior secured notes | 0 | 0 |  |
Subordinated indebtedness | (112,558) | (112,558) |  |
Deferred tax liabilities | (38,628) | (41,103) |  |
Intercompany payables | (74,046) | (73,372) |  |
Total liabilities | (274,409) | (276,139) |  |
Stockholders' equity |  |  |  |
Stockholders' equity attributable to Oppenheimer Holdings Inc. | (1,078,736) | (1,109,971) |  |
Noncontrolling interest | 0 | 0 |  |
Total stockholders' equity | (1,078,736) | (1,109,971) |  |
Total liabilities and stockholders' equity | (1,353,145) | (1,386,110) |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 302 | 907 | 603 | 439
Deposits with clearing organizations | 0 | 0 |  |
Receivable from brokers, dealers and clearing organizations | 0 | 0 |  |
Receivable from customers, net of allowance | 0 | 0 |  |
Income tax receivable | 41,022 | 33,801 |  |
Securities purchased under agreements to resell |  | 0 |  |
Securities owned | 0 | 0 |  |
Notes receivable, net of accumulated amortization and allowance for uncollectibles | 0 | 0 |  |
Office facilities, net of accumulated depreciation | 0 | 0 |  |
Assets held for sale | 0 | 0 |  |
Subordinated loan receivable | 0 | 0 |  |
Intangible assets | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Other assets | 128 | 69 |  |
Deferred tax assets | 100 | 317 |  |
Investment in subsidiaries | 584,576 | 577,320 |  |
Intercompany receivables | 45,174 | 60,187 |  |
Total assets | 671,302 | 672,601 |  |
Liabilities |  |  |  |
Drafts payable | 0 | 0 |  |
Bank call loans | 0 | 0 |  |
Payable to brokers, dealers and clearing organizations | 0 | 0 |  |
Payable to customers | 0 | 0 |  |
Securities sold under agreements to repurchase | 0 | 0 |  |
Securities sold, but not yet purchased, at fair value | 0 | 0 |  |
Liabilities held for sale | 0 | 0 |  |
Accrued compensation | 0 | 0 |  |
Accounts payable and other liabilities | 6,135 | 3,235 |  |
Income tax payable | 2,440 | 2,440 |  |
Senior secured notes | 149,231 | 148,868 |  |
Subordinated indebtedness | 0 | 0 |  |
Deferred tax liabilities | 0 | 0 |  |
Intercompany payables | 0 | 0 |  |
Total liabilities | 157,806 | 154,543 |  |
Stockholders' equity |  |  |  |
Stockholders' equity attributable to Oppenheimer Holdings Inc. | 513,496 | 518,058 |  |
Noncontrolling interest | 0 | 0 |  |
Total stockholders' equity | 513,496 | 518,058 |  |
Total liabilities and stockholders' equity | 671,302 | 672,601 |  |
Guarantor Subsidiaries [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 30,379 | 2,586 | 1,377 | 1,557
Deposits with clearing organizations | 0 | 0 |  |
Receivable from brokers, dealers and clearing organizations | 0 | 0 |  |
Receivable from customers, net of allowance | 0 | 0 |  |
Income tax receivable | 28,220 | 27,536 |  |
Securities purchased under agreements to resell |  | 0 |  |
Securities owned | 1,269 | 1,183 |  |
Notes receivable, net of accumulated amortization and allowance for uncollectibles | 0 | 0 |  |
Office facilities, net of accumulated depreciation | 21,803 | 20,793 |  |
Assets held for sale | 0 | 0 |  |
Subordinated loan receivable | 112,558 | 112,558 |  |
Intangible assets | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Other assets | 2,503 | 3,224 |  |
Deferred tax assets | 309 | 330 |  |
Investment in subsidiaries | 494,160 | 532,651 |  |
Intercompany receivables | 28,872 | 13,185 |  |
Total assets | 720,073 | 714,046 |  |
Liabilities |  |  |  |
Drafts payable | 0 | 0 |  |
Bank call loans | 0 | 0 |  |
Payable to brokers, dealers and clearing organizations | 0 | 0 |  |
Payable to customers | 0 | 0 |  |
Securities sold under agreements to repurchase | 0 | 0 |  |
Securities sold, but not yet purchased, at fair value | 0 | 0 |  |
Liabilities held for sale | 0 | 0 |  |
Accrued compensation | 0 | 0 |  |
Accounts payable and other liabilities | 34,191 | 35,812 |  |
Income tax payable | 22,189 | 22,189 |  |
Senior secured notes | 0 | 0 |  |
Subordinated indebtedness | 0 | 0 |  |
Deferred tax liabilities | 10 | 0 |  |
Intercompany payables | 62,205 | 62,204 |  |
Total liabilities | 118,595 | 120,205 |  |
Stockholders' equity |  |  |  |
Stockholders' equity attributable to Oppenheimer Holdings Inc. | 601,478 | 593,841 |  |
Noncontrolling interest | 0 | 0 |  |
Total stockholders' equity | 601,478 | 593,841 |  |
Total liabilities and stockholders' equity | 720,073 | 714,046 |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 68,363 | 59,871 | $ 45,331 | $ 61,811
Deposits with clearing organizations | 35,614 | 49,490 |  |
Receivable from brokers, dealers and clearing organizations | 255,818 | 365,791 |  |
Receivable from customers, net of allowance | 798,048 | 840,355 |  |
Income tax receivable | 0 | 0 |  |
Securities purchased under agreements to resell |  | 206,499 |  |
Securities owned | 1,026,664 | 733,648 |  |
Notes receivable, net of accumulated amortization and allowance for uncollectibles | 31,120 | 32,849 |  |
Office facilities, net of accumulated depreciation | 6,518 | 7,492 |  |
Assets held for sale | 11,748 | 99,881 |  |
Subordinated loan receivable | 0 | 0 |  |
Intangible assets | 31,700 | 31,700 |  |
Goodwill | 137,889 | 137,889 |  |
Other assets | 103,750 | 91,546 |  |
Deferred tax assets | 38,219 | 40,456 |  |
Investment in subsidiaries | 0 | 0 |  |
Intercompany receivables | 0 | 0 |  |
Total assets | 2,545,451 | 2,697,467 |  |
Liabilities |  |  |  |
Drafts payable | 31,414 | 48,011 |  |
Bank call loans | 132,000 | 100,200 |  |
Payable to brokers, dealers and clearing organizations | 154,168 | 164,546 |  |
Payable to customers | 517,681 | 594,833 |  |
Securities sold under agreements to repurchase | 528,113 | 651,445 |  |
Securities sold, but not yet purchased, at fair value | 295,507 | 126,493 |  |
Liabilities held for sale | 20,605 | 74,680 |  |
Accrued compensation | 120,976 | 149,092 |  |
Accounts payable and other liabilities | 65,444 | 69,590 |  |
Income tax payable | 24,548 | 24,477 |  |
Senior secured notes | 0 | 0 |  |
Subordinated indebtedness | 112,558 | 112,558 |  |
Deferred tax liabilities | 50,822 | 47,220 |  |
Intercompany payables | 11,841 | 11,168 |  |
Total liabilities | 2,065,677 | 2,174,313 |  |
Stockholders' equity |  |  |  |
Stockholders' equity attributable to Oppenheimer Holdings Inc. | 477,258 | 516,130 |  |
Noncontrolling interest | 2,516 | 7,024 |  |
Total stockholders' equity | 479,774 | 523,154 |  |
Total liabilities and stockholders' equity | $ 2,545,451 | $ 2,697,467 |  |

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4590271-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4568447-111683 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F + Details
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