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Employee Benefits and Share-Based Compensation - Stock Purchase Plan (Details) (1997 Employee Stock Purchase Plan [Member], Employee Stock [Member], USD $)
Share data in Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2009
1997 Employee Stock Purchase Plan [Member] | Employee Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum percentage of earnings allowed for purchase of shares 15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_PlanNameAxis
= omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
 
Maximum amount of annual salary permitted to utilize $ 25,000omcl_SharebasedCompensationArrangementbySharebasedPaymentAwardFairMarketThresholdforSharesPurchased
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_PlanNameAxis
= omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
 
Purchase price of common stock, percent 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_PlanNameAxis
= omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
 
Offering period 24 months  
Purchase period 6 months  
Shares added to reserved for future issuance   2.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_PlanNameAxis
= omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
Shares reserved for future issuance 0.4us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_PlanNameAxis
= omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
 
Shares of common stock purchased 0.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_PlanNameAxis
= omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
 
Shares issued for the 1997 Employee Stock Purchase Plan 4.9us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_PlanNameAxis
= omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
 
Unrecognized compensation cost $ 3,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_PlanNameAxis
= omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
 
Weighted average period of compensation cost recognized 8 months 12 days