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Regulatory Requirements - Additional Information (Narrative) (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
Regulatory Capital Requirements [Line Items]    
Net capital $ 878,000  
Excess Liquid Capital under Hong Kong SFC Rules 496,000  
Oppenheimer [Member]    
Regulatory Capital Requirements [Line Items]    
Required percentage of net capital to aggregate customer-related debit items 0.02  
Net Capital as Reported in Entity's Part II Unaudited FOCUS Report $ 202,400,000  
Aggregate indebtedness 26.30%  
Excess capital $ 187,000,000  
Freedom    
Regulatory Capital Requirements [Line Items]    
Net Capital as Reported in Entity's Part II Unaudited FOCUS Report $ 5,200,000  
Aggregate indebtedness 6.67%  
Freedom maintain net capital equal to the greater $ 100,000  
Net capital in excess of minimum required $ 5,100,000.0  
Oppenheimer Europe Ltd    
Regulatory Capital Requirements [Line Items]    
Common Equity Tier 1 Ratio 11.03% 11.03%
Common Equity Tier 1 Ratio Required 4.50% 4.50%
Tier 1 Capital Ratio 11.03% 11.03%
Tier 1 Capital Ratio Required 6.00% 6.00%
Total Capital Ratio 11.31% 11.31%
Total Capital Ratio Required 8.00% 8.00%
Regulatory capital required to be maintained | €   € 730,000
Oppenheimer Investments Asia Ltd.    
Regulatory Capital Requirements [Line Items]    
Regulatory capital required to be maintained $ 382,000