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Employee Compensation Plans - Schedule of Fair Value of Awarded Stock Option Estimated on Grant Date Using Black-Scholes Model (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |  |  |  |  |  |  |
Term granted for options | 5 years | [1] | 5 years | [1] | 5 years | [1] | 5 years | [1] | 4 years 6 months | [1]
Expected volatility factor | 56.31%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate | [2] | 53.82%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate | [2] | 54.95%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate | [2] | 52.52%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate | [2] | 48.58%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate | [2]
Risk-free interest rate | 1.49%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate | [3] | 0.84%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate | [3] | 0.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate | [3] | 2.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate | [3] | 2.62%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate | [3]
Actual dividends | $ 0.44 opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsActualDividendRateUsed | [4] | $ 0.44 opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsActualDividendRateUsed | [4] | $ 0.44 opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsActualDividendRateUsed | [4] | $ 0.44 opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsActualDividendRateUsed | [4] | $ 0.44 opy_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsActualDividendRateUsed | [4]
[1] | The expected term was determined based on actual awards.
[2] | The volatility factor was measured using the weighted average of historical daily price changes of the Company’s Class A Stock over a historical period commensurate to the expected term of the awards.
[3] | The risk-free interest rate was based on periods equal to the expected term of the awards based on the U.S. Treasury yield curve in effect at the time of grant.
[4] | Actual dividends were used to compute the expected annual dividend yield.

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- Definition The actual dividend rates (a percentage of the share price) used to compute the expected annual dividend yield. + References No definition available. + Details
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- Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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