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v2.4.1.9

Segment Information - Revenue Classified by Major Geographic Areas (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 254,928 us-gaap_Revenues | $ 244,679 us-gaap_Revenues | $ 249,689 us-gaap_Revenues | $ 255,168 us-gaap_Revenues | $ 293,362 us-gaap_Revenues | $ 243,376 us-gaap_Revenues | $ 243,830 us-gaap_Revenues | $ 239,146 us-gaap_Revenues | $ 1,004,464 us-gaap_Revenues | $ 1,019,714 us-gaap_Revenues | $ 952,612 us-gaap_Revenues
Americas |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 955,361 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 978,249 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US | 916,568 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Europe/Middle East |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 43,087 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = opy_EuropeMiddleEastMember | 36,516 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = opy_EuropeMiddleEastMember | 34,913 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = opy_EuropeMiddleEastMember
Asia |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | $ 6,016 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember | $ 4,949 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember | $ 1,131 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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