Cash and Securities Segregated for Regulatory and Other Purposes	12 Months Ended
Dec. 31, 2011
Cash and Securities Segregated For Regulatory and Other Purposes, Receivable from and Payable to Brokers and Clearing Organizations, Bank Call Loans and Regulatory requirements [Abstract]
Cash and Securities Segregated For Regulatory and Other Purposes	3. Cash and Securities Segregated For Regulatory and Other Purposes Deposits of $30.1 million were held at year-end in special reserve bank accounts for the exclusive benefit of customers in accordance with regulatory requirements at December 31, 2011 ($29.9 million at December 31, 2010). To the extent permitted, these deposits are invested in interest bearing accounts collateralized by qualified securities. OMHHF had client funds held in escrow totaling $166.7 million at December 31, 2011 ($112.5 million at December 31, 2010) which are not required to be and, accordingly, are not carried on the Company’s consolidated balance sheet. In 2010 and prior, these amounts were included on the consolidated balance sheet. The consolidated balance sheet as of December 31, 2010 has been adjusted to reflect this change. Oppenheimer Trust had a deposit of $100,000 with the State of Ohio at December 31, 2011.

- Definition

The entire disclosure for financial services, specifically for brokers and dealers, for the accounting period and at the balance sheet date. Disclosure may include amounts receivable from and payable to broker-dealers and clearing organizations, including securities failed to receive, deposits received for securities loaned, amounts payable to clearing organizations related to open transactions, floor brokerage payables and payables for commodities futures accounts liquidating to an equity balance on a broker-dealer's records. May also include disclosure on company's consolidation policy and a note indicating the amount of the broker-dealer's actual net capital and the amount of required net capital.

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