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Regulatory Requirements - Narrative (Details)
6 Months Ended
Jun. 30, 2017
USD ($)
Oppenheimer [Member]  
Regulatory Capital Requirements [Line Items]  
Required percentage of net capital to aggregate customer-related debit items 2.00%
Initial capital $ 130,200,000
Aggregate indebtedness 11.62%
Excess capital $ 107,800,000
Freedom [Member]  
Regulatory Capital Requirements [Line Items]  
Initial capital $ 5,500,000
Aggregate indebtedness 6.67%
Excess capital $ 5,400,000
Freedom maintain net capital equal to the greater $ 100,000
Oppenheimer Europe Ltd [Member] | Basel Three New Requirements [Member]  
Regulatory Capital Requirements [Line Items]  
Common equity Tier 1 capital ratio 13.37%
Common equity Tier 1 required 4.50%
Tier 1 capital ratio 13.37%
Tier 1 capital ratio required 6.00%
Total capital ratio 14.89%
Total capital ratio required 8.00%
Oppenheimer Investments Asia [Member]  
Regulatory Capital Requirements [Line Items]  
Initial capital $ 2,300,000
Excess capital 1,900,000
Initial required capital $ 387,000