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Deferred Gross Profit - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]    
Total deferred gross profit $ 24,334omcl_DeferredRevenueGoods $ 28,558omcl_DeferredRevenueGoods
Products with Installation Services [Member]    
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]    
Sales of medication and supply dispensing systems including packaging equipment 34,605omcl_SalesofRevenuesGoodsEquipment
/ us-gaap_DeferredRevenueArrangementTypeAxis
= omcl_ProductswithInstallationServicesMember		 36,947omcl_SalesofRevenuesGoodsEquipment
/ us-gaap_DeferredRevenueArrangementTypeAxis
= omcl_ProductswithInstallationServicesMember
Less: cost of revenues, excluding installation costs (10,271)omcl_CostofGoodsSoldEquipmentNetofInstallation
/ us-gaap_DeferredRevenueArrangementTypeAxis
= omcl_ProductswithInstallationServicesMember		 (8,389)omcl_CostofGoodsSoldEquipmentNetofInstallation
/ us-gaap_DeferredRevenueArrangementTypeAxis
= omcl_ProductswithInstallationServicesMember
Total deferred gross profit $ 24,334omcl_DeferredRevenueGoods
/ us-gaap_DeferredRevenueArrangementTypeAxis
= omcl_ProductswithInstallationServicesMember		 $ 28,558omcl_DeferredRevenueGoods
/ us-gaap_DeferredRevenueArrangementTypeAxis
= omcl_ProductswithInstallationServicesMember