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Financial instruments - Notional and Fair Values of TBAs (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
FHA loan commitments balance	$ 304.4	$ 326.7
OMHHF had a loan receivable balance (included in other assets)	$ 22.9	$ 109.3

X

- Definition

This balance represents a loan commitment that the company commits to provide to fund the FHA loans.

+ References

No definition available.

+ Details

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

X

- Definition

This represents the prior loan commitments that have been funded but not yet been securitized.

+ References

No definition available.

+ Details

Name:	opy_LoanPurchasedUnderCommitmentFromFederalHousingAdministration
Namespace Prefix:	opy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration