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Segment Information - Reported Revenue and Profit Before Income Taxes (Parenthetical) (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Asset Management [Member]
Operating Statistics [Line Items]
Asset management revenue	22.50%	22.50%	22.50%	22.50%
Private Client [Member]
Operating Statistics [Line Items]
Asset management revenue	77.50%	77.50%	77.50%	77.50%

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- Definition

Asset management revenue.

+ References

No definition available.

+ Details

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

X

- Details

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