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Regulatory Requirements - Narrative (Details)
3 Months Ended
Mar. 31, 2016
USD ($)
Oppenheimer [Member]  
Regulatory Capital Requirements [Line Items]  
Required percentage of net capital to aggregate customer-related debit items 2.00%
Initial capital $ 112,800,000
Aggregate indebtedness 9.61%
Excess capital $ 89,300,000
Freedom [Member]  
Regulatory Capital Requirements [Line Items]  
Initial capital $ 5,700,000
Aggregate indebtedness 6.67%
Freedom maintain net capital equal to the greater $ 100,000
Net capital in excess of minimum required $ 5,600,000
Oppenheimer Europe Ltd [Member] | Basel Three New Requirements [Member]  
Regulatory Capital Requirements [Line Items]  
Common equity Tier 1 capital ratio 12.32%
Common equity Tier 1 required 4.50%
Tier 1 capital ratio 12.32%
Tier 1 capital ratio required 6.00%
Total capital ratio 13.75%
Total capital ratio required 8.00%
Oppenheimer Investments Asia [Member]  
Regulatory Capital Requirements [Line Items]  
Initial capital $ 2,200,000
Net capital in excess of minimum required 1,800,000
Initial required capital $ 387,000