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Regulatory Requirements - Narrative (Details)
9 Months Ended
Sep. 30, 2016
USD ($)
Oppenheimer [Member]  
Regulatory Capital Requirements [Line Items]  
Required percentage of net capital to aggregate customer-related debit items 2.00%
Initial capital $ 124,200,000
Aggregate indebtedness 12.39%
Excess capital $ 104,100,000
Freedom [Member]  
Regulatory Capital Requirements [Line Items]  
Initial capital $ 5,600,000
Aggregate indebtedness 6.67%
Freedom maintain net capital equal to the greater $ 100,000
Net capital in excess of minimum required $ 5,500,000
Oppenheimer Europe Ltd [Member] | Basel Three New Requirements [Member]  
Regulatory Capital Requirements [Line Items]  
Common equity Tier 1 capital ratio 12.53%
Common equity Tier 1 required 4.50%
Tier 1 capital ratio 12.53%
Tier 1 capital ratio required 6.00%
Total capital ratio 13.96%
Total capital ratio required 8.00%
Oppenheimer Investments Asia [Member]  
Regulatory Capital Requirements [Line Items]  
Initial capital $ 2,700,000
Net capital in excess of minimum required 2,300,000
Initial required capital $ 387,000