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Employee Benefits and Share-Based Compensation - Stock Award Plans (Details)
0 Months Ended 3 Months Ended 0 Months Ended 12 Months Ended
Mar. 03, 2015
Mar. 31, 2015
Feb. 06, 2015
Dec. 31, 2014
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentile rank of stockholder return 74.40%omcl_ShareBasedCompensationArrangementbySharebasedPaymentDeterminationofPerformanceBasedAward
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Percentage of shares eligible for time-based vesting 100.00%omcl_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsPercentEligibleforTimebasedVesting
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Awards eligible for vesting 132,500omcl_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsEligibleforVesting
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Shares vested   33,124us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     60,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Performance Shares [Member] | Vested immediately [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award vesting 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember
  25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember
 
Performance Shares [Member] | Vesting years subsequent the date of grant [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years   3 years  
2009 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for future issuance   1,500,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= omcl_TwoThousandNinePlanMember
   
2009 Plan [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted   60,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= omcl_TwoThousandNinePlanMember
   
Shares vested   33,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= omcl_TwoThousandNinePlanMember
   
Executive Officer [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted   60,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
  132,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember