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Goodwill and intangibles - Additional Information (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Goodwill $ 137,889us-gaap_Goodwill $ 137,889us-gaap_Goodwill
Carrying value of intangibles 31,700us-gaap_IntangibleAssetsNetExcludingGoodwill 31,700us-gaap_IntangibleAssetsNetExcludingGoodwill
Trademarks and Trade Name    
Goodwill [Line Items]    
Carrying value of intangibles 31,700us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= opy_TrademarksAndTradeNameMember		  
PCD    
Goodwill [Line Items]    
Goodwill $ 137,900us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= opy_PCDMember