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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Income Taxes [Line Items]        
Goodwill amortized   15 years    
Deferred tax asset arising from New York State Investment Tax Credits and Employment Incentive Credits   $ 982,000    
Credits expiration date   2027    
Profit (loss) before income taxes for foreign operations   (2,400,000) 1,300,000 3,700,000
Recorded adjustments net of taxes related to prior periods 1,300,000      
Tax credits related to investment   1,900,000    
Income tax-related interest (benefit) expense   (408,000) 753,000  
Unrecognized tax benefits   5,236,000 2,317,000  
Unrecognized tax benefits that would impact effective tax rate   661,000    
Unrecognized deferred tax liability related to earnings of foreign subsidiaries   1,400,000    
Income tax-related interest payable   345,000 753,000  
New York State [Member] | Minimum [Member]
        
Schedule Of Income Taxes [Line Items]        
Income tax examination year   2008    
New York State [Member] | Maximum [Member]
        
Schedule Of Income Taxes [Line Items]        
Income tax examination year   2011    
New York City [Member]
        
Schedule Of Income Taxes [Line Items]        
Income tax examination year   2008    
Oppenheimer Israel (OPCO) Ltd. [Member]
        
Schedule Of Income Taxes [Line Items]        
Net operating loss carryforward   2,800,000    
Oppenheimer Investments Asia Ltd. [Member]
        
Schedule Of Income Taxes [Line Items]        
Net operating loss carryforward   $ 1,000,000