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Fair Value Measurements - Securities Owned and Securities Sold, But Not Yet Purchased at Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	$ 955,363us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned	$ 843,155us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned
Securities Sold	184,649us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased	92,510us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased
U.S. Government, Agency and Sovereign Obligations [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	662,364us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember	570,607us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember
Securities Sold	131,588us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember	30,615us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember
Corporate Debt and Other Obligations [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	14,813us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember	19,795us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Securities Sold	4,533us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember	2,646us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Mortgage and Other Asset-Backed Securities [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	3,982us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember	6,689us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Securities Sold	1us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember	255us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Municipal Obligations [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	83,942us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember	60,833us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember
Securities Sold	51us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember	51us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember
Convertible Bonds [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	41,054us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember	49,813us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember
Securities Sold	11,453us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember	11,369us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember
Corporate Equities [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	49,760us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = opy_CorporateEquitiesMember	42,751us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = opy_CorporateEquitiesMember
Securities Sold	37,023us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = opy_CorporateEquitiesMember	47,574us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = opy_CorporateEquitiesMember
Money Markets [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	391us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember	1,245us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Securities Sold	0us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember	0us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Auction Rate Securities [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned	99,057us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember	91,422us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember
Securities Sold	$ 0us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember	$ 0us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember

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Fair value of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 320

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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Fair value of financial instruments sold short by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 320

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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