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Goodwill and Intangible Assets - Carrying Amount of Goodwill (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Goodwill [Roll Forward] |
Net balance Beginning of the Period | $ 122,720 us-gaap_Goodwill
Foreign currency exchange rate fluctuations | (504)us-gaap_GoodwillTranslationAdjustments
Net balance End of the Period | 122,216 us-gaap_Goodwill
Automation and Analytics [Member] |
Goodwill [Roll Forward] |
Net balance Beginning of the Period | 28,543 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_AutomationandAnalyticsMember
Foreign currency exchange rate fluctuations | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = omcl_AutomationandAnalyticsMember
Net balance End of the Period | 28,543 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_AutomationandAnalyticsMember
Medication Adherence [Member] |
Goodwill [Roll Forward] |
Net balance Beginning of the Period | 94,177 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_MedicationAdherenceMember
Foreign currency exchange rate fluctuations | (504)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = omcl_MedicationAdherenceMember
Net balance End of the Period | $ 93,673 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = omcl_MedicationAdherenceMember

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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
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_GoodwillRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_GoodwillTranslationAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=omcl_AutomationandAnalyticsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=omcl_MedicationAdherenceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |