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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 | Dec. 31, 2014 | Dec. 31, 2013
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Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities Owned | $ 843,155 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned | $ 856,088 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned
Securities Sold | 92,510 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased | 76,314 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased
U.S. Government, agency and sovereign obligations |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities Owned | 570,607 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember | 596,114 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember
Securities Sold | 30,615 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember | 11,889 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_USTreasuryAndGovernmentMember
Corporate debt and other obligations |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities Owned | 19,795 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 14,673 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Securities Sold | 2,646 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 4,847 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Mortgage and other asset-backed securities |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities Owned | 6,689 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 3,395 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Securities Sold | 255 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 7 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Municipal obligations |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities Owned | 60,833 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember | 40,166 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember
Securities Sold | 51 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember | 72 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalNotesMember
Convertible bonds |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities Owned | 49,813 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember | 53,719 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember
Securities Sold | 11,369 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember | 13,922 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_ConvertibleDebtSecuritiesMember
Corporate equities |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities Owned | 42,751 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = opy_CorporateEquitiesMember | 61,634 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = opy_CorporateEquitiesMember
Securities Sold | 47,574 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = opy_CorporateEquitiesMember | 45,336 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = opy_CorporateEquitiesMember
Money markets |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities Owned | 1,245 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 1,263 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Securities Sold | 0 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 241 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Auction rate securities |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities Owned | 91,422 us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecurityOwned / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRateSecuritiesMember | 85,124 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=28364263&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=29643736&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=28364263&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=29643736&loc=d3e42546-110969 + Details
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