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Business Combinations - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed, MedPak (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 21, 2012
Business Acquisition [Line Items]        
Goodwill $ 122,720us-gaap_Goodwill $ 111,343us-gaap_Goodwill $ 111,407us-gaap_Goodwill  
MedPak Holdings, Inc. [Member]        
Business Acquisition [Line Items]        
Cash       2,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member
Accounts receivable       7,403us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member
Inventory       11,726us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member
Deferred tax assets and other current assets       2,894us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member
Total current assets       24,023us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member
Property and equipment       9,807us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member
Intangible assets       83,900us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member
Goodwill       82,800us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member
Other long-term assets       308us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member
Total assets       200,838omcl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetsincludingGoodwillTotal
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member
Current liabilities       (7,917)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member
Long-term deferred tax liabilities       (33,386)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member
Other long-term liabilities       (1,223)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member
Total purchase price       $ 158,312us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= omcl_MedPakHoldingsInc.Member