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Business Combinations - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed, Surgichem (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 22, 2014
Business Acquisition [Line Items]        
Goodwill $ 122,720us-gaap_Goodwill $ 111,343us-gaap_Goodwill $ 111,407us-gaap_Goodwill  
Surgichem [Member]        
Business Acquisition [Line Items]        
Cash       153us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= omcl_SurgichemMember
Accounts receivable       2,462us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= omcl_SurgichemMember
Inventory       2,190us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= omcl_SurgichemMember
Deferred tax assets and other current assets       361us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= omcl_SurgichemMember
Total current assets       5,166us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= omcl_SurgichemMember
Property and equipment       164us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= omcl_SurgichemMember
Intangible assets       5,730us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= omcl_SurgichemMember
Goodwill       12,112us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= omcl_SurgichemMember
Total assets       23,172omcl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetsincludingGoodwillTotal
/ us-gaap_BusinessAcquisitionAxis
= omcl_SurgichemMember
Current liabilities       1,191us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= omcl_SurgichemMember
Long-term deferred tax liabilities       1,104us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= omcl_SurgichemMember
Total purchase price       $ 20,877us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= omcl_SurgichemMember