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Regulatory Requirements - Additional Information (Detail) (USD $)
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Oppenheimer [Member]
Sep. 30, 2013
Freedom [Member]
Sep. 30, 2013
Oppenheimer Europe Ltd [Member]
Sep. 30, 2013
Oppenheimer Investments Asia Ltd. [Member]
Regulatory Capital Requirements [Line Items]            
Required percentage of net capital to aggregate customer-related debit items     2.00%      
Net capital     $ 159,000,000 $ 4,500,000 $ 5,300,000 $ 1,300,000
Actual percentage of net capital to aggregate customer-related debit items     12.20%      
Excess capital     132,800,000      
Freedom maintain net capital equal to the greater       250,000    
Aggregate indebtedness       6.67%    
Net capital in excess of minimum required       4,200,000 1,900,000 905,000
Cash and securities segregated for regulatory and other purposes 36,569,000 33,000,000 17,400,000 18,300,000    
Regulatory capital required to be maintained         $ 3,400,000 $ 387,000