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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
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Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities Owned | $ 955,363 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned | $ 843,155 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned
Securities Sold | 184,649 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased | 92,510 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased
U.S. Government, Agency and Sovereign Obligations [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities Owned | 662,364 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember | 570,607 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember
Securities Sold | 131,588 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember | 30,615 us-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 | 14,813 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 19,795 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Securities Sold | 4,533 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 2,646 us-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 | 3,982 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 6,689 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Securities Sold | 1 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 255 us-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 | 83,942 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember | 60,833 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember
Securities Sold | 51 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember | 51 us-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 | 41,054 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember | 49,813 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember
Securities Sold | 11,453 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember | 11,369 us-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 | 49,760 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = opy_CorporateEquitiesMember | 42,751 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = opy_CorporateEquitiesMember
Securities Sold | 37,023 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = opy_CorporateEquitiesMember | 47,574 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = opy_CorporateEquitiesMember
Money Markets [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities Owned | 391 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 1,245 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Securities Sold | 0 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 0 us-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 | 99,057 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember | 91,422 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember
Securities Sold | $ 0 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember | $ 0 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember

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- Definition 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 + Details
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- Definition 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 + Details
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