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Income Taxes - Additional Information (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule Of Income Taxes [Line Items] |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | $ 231,000 |  |  |
Unrecognized Tax Benefit, Reversal of Income Tax Interest Payable |  | $ 104,000 |  |
Profit (loss) before income taxes for foreign operations | $ (8,500,000) | $ (965,000) | $ 732,000 |
Effective Income Tax Rate Reconciliation, Percent | (10.80%) | 56.00% | (16.70%) |
Effective Income Tax Reconciliation, impact of the TCJA Tax Reform | $ 9,013,000 | $ 0 | $ 0 |
Impact of the TCJA Tax Reform, adjustment related to re-measurement of deferred tax liabilities | 29,000,000 |  |  |
Impact of the TCJA Tax Reform, adjustment related to re-measurement of deferred tax assets | 19,600,000 |  |  |
Impact of the TCJA Tax Reform, Other Adjustments | 400,000 |  |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | 11,200,000 |  |  |
Unrecognized deferred tax liability related to earnings of foreign subsidiaries | 3,000,000 |  |  |
Valuation allowance | $ 1,350,000 | 1,280,000 |  |
Goodwill amortized period | 15 years |  |  |
Unrecognized tax benefits | $ 1,079,000 | 1,088,000 | 2,490,000 | $ 1,583,000
Unrecognized tax benefit that would impact tax rate | 853,000,000,000 | 710,000 |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 9,000 | 652,000 | 0 |
Income tax-related interest payable | 232,000 | 1,000 |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 0 | $ 848,000 | $ 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 | $ 3,100,000 |  |  |
Oppenheimer Europe Ltd |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | $ 541,000 |  |  |

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