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Income Taxes - Additional Information (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Income Taxes [Line Items] |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | $ 87,000 | $ 113,000 |  |
Profit (loss) before income taxes for foreign operations | $ (4,900,000) | $ 4,000,000 | $ 8,500,000 |
Effective Income Tax Rate Reconciliation, Percent | 29.30% | 35.60% | (10.80%) |
Effective Income Tax Reconciliation, impact of the TCJA Tax Reform | $ 0 | $ 0 | $ 9,013,000 |
Valuation allowance | 4,368,000 | $ 3,204,000 |  |
Goodwill amortized period |  | 15 years |  |
Unrecognized tax benefits | 1,079,000 | $ 1,079,000 | 1,079,000 | $ 1,088,000
Unrecognized tax benefit that would impact tax rate | 853,000,000,000 | 853,000 |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 0 | 0 | 9,000 |
Income tax-related interest payable | 432,000 | 345,000 |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 0 | $ 0 | $ 0 |
State and Local Jurisdiction | New York State | Minimum [Member] |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Income tax examination year | 2011 |  |  |
State and Local Jurisdiction | New York State | Maximum [Member] |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Income tax examination year | 2014 |  |  |
State and Local Jurisdiction | New York City | Minimum [Member] |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Income tax examination year | 2009 |  |  |
State and Local Jurisdiction | New York City | Maximum [Member] |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Income tax examination year | 2012 |  |  |
Oppenheimer Israel (OPCO) Ltd. |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | $ 2,900,000 |  |  |
Oppenheimer Europe [Member] |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Valuation allowance | $ 700,000 |  |  |

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