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Segment Information - Revenue Classified by Major Geographic Areas (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total revenue | $ 245,561 us-gaap_Revenues | $ 255,168 us-gaap_Revenues
United States [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total revenue | 233,031 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 240,328 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
United Kingdom Israel [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total revenue | 10,972 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = opy_UnitedKingdomIsraelMember | 13,837 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = opy_UnitedKingdomIsraelMember
CHINA |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Total revenue | $ 1,558 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CN | $ 1,003 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CN

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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