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Goodwill and Intangible Assets - Carrying Amount of Goodwill (Details) (USD $) | 12 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Aug. 22, 2014
Goodwill [Roll Forward] |  |  |  |
Net balance as of December 31, | $ 111,343,000 us-gaap_Goodwill | $ 111,407,000 us-gaap_Goodwill |  |
Additions | 12,112,000 us-gaap_GoodwillAcquiredDuringPeriod | 0 us-gaap_GoodwillAcquiredDuringPeriod |  |
Adjustments | (735,000)us-gaap_GoodwillTranslationAdjustments | (64,000)us-gaap_GoodwillTranslationAdjustments |  |
Net balance as of December 31, | 122,720,000 us-gaap_Goodwill | 111,343,000 us-gaap_Goodwill | 122,720,000 us-gaap_Goodwill |
Automation and Analytics [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Net balance as of December 31, | 28,543,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_AutomationandAnalyticsMember | 28,543,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_AutomationandAnalyticsMember |  |
Additions | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = omcl_AutomationandAnalyticsMember | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = omcl_AutomationandAnalyticsMember |  |
Adjustments | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = omcl_AutomationandAnalyticsMember | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = omcl_AutomationandAnalyticsMember |  |
Net balance as of December 31, | 28,543,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_AutomationandAnalyticsMember | 28,543,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_AutomationandAnalyticsMember | 28,543,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_AutomationandAnalyticsMember |
Medication Adherence [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Net balance as of December 31, | 82,800,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_MedicationAdherenceMember | 82,864,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_MedicationAdherenceMember |  |
Additions | 12,112,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = omcl_MedicationAdherenceMember | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = omcl_MedicationAdherenceMember |  |
Adjustments | (735,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = omcl_MedicationAdherenceMember | (64,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = omcl_MedicationAdherenceMember |  |
Net balance as of December 31, | 94,177,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_MedicationAdherenceMember | 82,800,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_MedicationAdherenceMember | 94,177,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_MedicationAdherenceMember |
Surgichem [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Net balance as of December 31, |  |  |  | 12,112,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember
Net balance as of December 31, |  |  |  | 12,112,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember
Surgichem Acquisition, adjustment to purchase price |  |  | $ 100,000 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember |

X
- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1500-128463 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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