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Income taxes - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Examination [Line Items] |  |  |  |
Profit (loss) before income taxes for foreign operations | $ 732,000 | $ 4,300,000 | $ (1,300,000) |
Tax credit, investment, amount | 20,500,000 |  |  |
Unrecognized deferred tax liability related to earnings of foreign subsidiaries | $ 2,500,000 |  |  |
Goodwill amortized period | 15 years |  |  |
Unrecognized tax benefits | $ 2,490,000 | 1,583,000 | 1,574,000 | $ 5,236,000
Unrecognized tax benefits that would impact effective tax rate | 1,800,000 | 1,300,000 |  |
Reclass to other tax accounts | 0 | 0 | $ 4,907,000 |
Income tax-related interest (benefit) expense | 23,000 | 22,000 |  |
Income tax-related interest payable | $ 106,000 | $ 83,000 |  |
State and Local Jurisdiction | New York State | Minimum |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Income tax examination year | 2008 |  |  |
State and Local Jurisdiction | New York State | Maximum |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Income tax examination year | 2011 |  |  |
State and Local Jurisdiction | New York City | Minimum |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Income tax examination year | 2009 |  |  |
State and Local Jurisdiction | New York City | Maximum |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Income tax examination year | 2012 |  |  |
Oppenheimer Israel (OPCO) Ltd. |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Net operating loss carryforward | $ 1,300,000 |  |  |
Oppenheimer Investments Asia Ltd. |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Net operating loss carryforward | 1,000,000 |  |  |
Oppenheimer Europe Ltd |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Net operating loss carryforward | $ 397,000 |  |  |

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