XML 101 R86.htm IDEA: XBRL DOCUMENT v3.8.0.1
Regulatory Requirements - Additional Information (Narrative) (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Oppenheimer  
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 142,000,000
Excess capital $ 121,700,000
Aggregate indebtedness 14.00%
Freedom  
Regulatory Capital Requirements [Line Items]  
Net Capital as Reported in Entity's Part II Unaudited FOCUS Report $ 5,300,000
Freedom maintain net capital equal to the greater $ 100,000
Aggregate indebtedness 6.67%
Net capital in excess of minimum required $ 5,200,000
Oppenheimer Investments Asia Ltd.  
Regulatory Capital Requirements [Line Items]  
Net capital 1,600,000
Excess Liquid Capital under Hong Kong SFC Rules 1,200,000
Regulatory capital required to be maintained $ 387,000
Basel Three New Requirements [Member] | Oppenheimer Europe Ltd  
Regulatory Capital Requirements [Line Items]  
Common Equity Tier 1 Ratio 27.27%
Common Equity Tier 1 Ratio Required 4.50%
Tier 1 Capital Ratio 27.27%
Tier 1 Capital Ratio Required 6.00%
Total Capital Ratio 28.79%
Total Capital Ratio Required 8.00%