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Long-term Debt - Narrative (Details) (USD $) | 0 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 15, 2014 | Apr. 12, 2011 | Mar. 31, 2015 | Apr. 15, 2014 | Mar. 31, 2014 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Senior secured notes |  |  | $ 150,000,000 us-gaap_SecuredDebt |  |  | $ 150,000,000 us-gaap_SecuredDebt
Senior Secured Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Private placement date |  | Apr. 12, 2011 |  |  |  |
Issuance of private placement, principal amount |  | 200,000,000.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  |  |
Interest rate |  | 8.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  |  |
Term of payments of interest on notes |  | semi-annually |  |  |  |
Total amount of debt to be retired | 50,000,000 opy_DebtInstrumentRetiredPrincipalAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  | 50,000,000 opy_DebtInstrumentRetiredPrincipalAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |
Percentage of debt to be retired from the total debt | 25.00%opy_DebtInstrumentPercentageOfPrincipalAmountRetired / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  | 25.00%opy_DebtInstrumentPercentageOfPrincipalAmountRetired / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |
Aggregate face amount of debt redeemed | 45,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  | 45,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |
Redemption price as a percentage of face amount |  |  |  | 106.563%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |
Senior secured notes | 150,000,000 us-gaap_SecuredDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  | 150,000,000 us-gaap_SecuredDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |
Annual interest cost reduction due to retirement of debt | 3,900,000 opy_ReductionInInterestExpenses / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  |  |  |  |
Interest expense on note |  |  | 3,300,000 us-gaap_InterestExpenseLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |  | 4,300,000 us-gaap_InterestExpenseLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember |
November Two Thousand Eleven Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total amount of debt to be retired | $ 5,000,000 opy_DebtInstrumentRetiredPrincipalAmount / us-gaap_LongtermDebtTypeAxis = opy_NovemberTwoThousandElevenSeniorNotesMember |  |  | $ 5,000,000 opy_DebtInstrumentRetiredPrincipalAmount / us-gaap_LongtermDebtTypeAxis = opy_NovemberTwoThousandElevenSeniorNotesMember |  |

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- Definition Principal amount of debt instrument that was retired + References No definition available. + Details
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- Definition Reduction in interest expenses. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Description of the frequency of periodic payments (monthly, quarterly, annual). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the debt instrument was issued, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Aggregate amount of interest paid or due on all long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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