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Bank Call Loans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Of Bank Call Loans [Line Items]
Broker call rate	2.00%	2.00%
Interest expense on bank call loans	$ 996,200	$ 1,200,000	$ 805,200

X

- Definition

Broker call rate as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	opy_BrokerCallRate
Namespace Prefix:	opy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Interest Expense on Bank Call Loans

+ References

No definition available.

+ Details

Name:	opy_InterestExpenseOnBankCallLoans
Namespace Prefix:	opy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

Name:	opy_ScheduleOfBankCallLoansLineItems
Namespace Prefix:	opy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration