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Income Taxes - Additional Information (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule Of Income Taxes [Line Items] |  |  |  |
Unrecognized Tax Benefit, Reversal of Income Tax Interest Payable | $ 104,000 |  |  |
Profit (loss) before income taxes for foreign operations | $ (965,000) | $ 732,000 | $ 4,300,000 |
Effective Income Tax Rate Reconciliation, Percent | 56.00% | (16.70%) | 70.60% |
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | $ 20,300,000 |  |  |
Unrecognized deferred tax liability related to earnings of foreign subsidiaries | 2,300,000 |  |  |
Valuation allowance | $ 1,280,000 | $ 126,000 |  |
Goodwill amortized period | 15 years |  |  |
Unrecognized tax benefits | $ 1,088,000 | 2,490,000 | $ 1,583,000 | $ 1,574,000
Unrecognized tax benefit that would impact tax rate | 710,000,000,000 | 1,800,000 |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 652,000 | 0 | 0 |
Income tax-related interest (benefit) expense |  | 23,000 |  |
Income tax-related interest payable | 1,000 | 106,000 |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 848,000 | $ 0 | $ 0 |
State and Local Jurisdiction | New York State | Minimum [Member] |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Income tax examination year | 2008 |  |  |
State and Local Jurisdiction | New York State | Maximum [Member] |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Income tax examination year | 2010 |  |  |
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 | $ 1,100,000 |  |  |
Oppenheimer Investments Asia Ltd. |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | 1,200,000 |  |  |
Valuation allowance | 1,200,000 |  |  |
Oppenheimer Europe Ltd |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | $ 397,000 |  |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to investment tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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