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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Income Taxes [Line Items]      
Profit (loss) before income taxes for foreign operations $ (1,300,000) $ (2,400,000) $ 1,300,000
Tax credits related to investment 335,500 1,900,000  
Unrecognized deferred tax liability related to earnings of foreign subsidiaries 1,600,000    
Deferred tax asset arising from New York State Investment Tax Credits and Employment Incentive Credits (7,096,000) 16,340,000  
Credits expiration date 2027    
Goodwill amortized period 15 years    
Unrecognized tax benefits 1,574,000 5,236,000 2,317,000
Reclass to other tax accounts 4,907,000    
Unrecognized tax benefit that would impact tax rate 1,300,000 661,000  
Income tax-related interest (benefit) expense (284,000) (408,000)  
Income tax-related interest payable 61,000 345,000  
State and Local Jurisdiction [Member]
      
Schedule Of Income Taxes [Line Items]      
Deferred tax asset arising from New York State Investment Tax Credits and Employment Incentive Credits 1,000,000    
Oppenheimer Israel (OPCO) Ltd. [Member]
      
Schedule Of Income Taxes [Line Items]      
Net operating loss carryforward 3,000,000    
Oppenheimer Investments Asia Ltd. [Member]
      
Schedule Of Income Taxes [Line Items]      
Net operating loss carryforward 1,000,000    
Oppenheimer Europe Ltd [Member]
      
Schedule Of Income Taxes [Line Items]      
Net operating loss carryforward $ 479,000    
New York State [Member] | State and Local Jurisdiction [Member] | Minimum [Member]
      
Schedule Of Income Taxes [Line Items]      
Income tax examination year 2008    
New York State [Member] | State and Local Jurisdiction [Member] | Maximum [Member]
      
Schedule Of Income Taxes [Line Items]      
Income tax examination year 2011    
New York City [Member] | State and Local Jurisdiction [Member]
      
Schedule Of Income Taxes [Line Items]      
Income tax examination year 2008