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Organization and Basis of Presentation - Narrative (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
country
Dec. 31, 2014
Organization And Basis Of Presentation [Line Items]    
Number of foreign jurisdiction 6us-gaap_NumberOfCountriesInWhichEntityOperates  
Percentage of controlling interest owned by the company in OMHHF 83.68%opy_MajorityInterestOwnershipPercentageByParent  
Noncontrolling interest $ 6,490us-gaap_MinorityInterest $ 6,088us-gaap_MinorityInterest
United States [Member]    
Organization And Basis Of Presentation [Line Items]    
Number of Stores 93us-gaap_NumberOfStores
/ us-gaap_StatementGeographicalAxis
= country_US		  
Number of states in which an entity operates 24us-gaap_NumberOfStatesInWhichEntityOperates
/ us-gaap_StatementGeographicalAxis
= country_US