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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
0 Months Ended 12 Months Ended
May 19, 2009
Dec. 31, 2014
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   0.6us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_PlanNameAxis
= omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
Share of common stock purchased   0.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_PlanNameAxis
= omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
Shares issued for the 1997 Employee Stock Purchase Plan   4.7us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_PlanNameAxis
= omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
Unrecognized compensation cost   $ 1,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_PlanNameAxis
= omcl_NineteenNinetySevenEmployeeStockPurchasePlanMember
Weighted average period of compensation cost recognized   8 months 12 days