Name:	opy_CommonEquityTierOneRatioRequiredUnderCrdFourth
Namespace Prefix:	opy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Excess Liquid Capital under Hong Kong SFC Rules

No definition available.

Name:	opy_ExcessLiquidCapitalunderHongKongSFCRules
Namespace Prefix:	opy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Liquid Capital under Hong Kong SFC Rules

No definition available.

Name:	opy_LiquidCapitalunderHongKongSFCRules
Namespace Prefix:	opy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Percentage of net capital to aggregate indebtedness.

No definition available.

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

Tier One Capital Ratio calculated for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union.

No definition available.

Name:	opy_TierOneCapitalRatioCalculatedUnderCrdFourth
Namespace Prefix:	opy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Tier One Capital Ratio required for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union.

No definition available.

Name:	opy_TierOneCapitalRatioRequiredUnderCrdFourth
Namespace Prefix:	opy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Total Capital Ratio calculated for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union.

No definition available.

Name:	opy_TotalCapitalRatioCalculatedUnderCrdFourth
Namespace Prefix:	opy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Total Capital Ratio Required for capital adequacy purposes under the Capital Requirements Directive (DRD IV) in the European Union.

No definition available.

Name:	opy_TotalCapitalRatioRequiredUnderCrdFourth
Namespace Prefix:	opy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Amount of net capital in excess of minimum required net capital, calculated under Alternative Standard.