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Segment Information - Additional Information (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 customer | Jun. 30, 2014 customer | Jun. 30, 2015 segment customer | Jun. 30, 2014 customer
Segment Reporting [Abstract] |  |  |  |
Period of completed acquisitions |  |  | 2 years |
Number of segments |  |  | 2 |
Number of reportable segments |  |  | 2 |
Number of significant customers that accounted for more than 10% of accounts receivables | customer | 0 | 0 | 0 | 0

X
- Definition Business Combinations, Duration of Completed Acquisitions + References No definition available. + Details
Name: | omcl_BusinessCombinationsDurationofCompletedAcquisitions
Namespace Prefix: | omcl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Concentration Risk, Customer, Number + References No definition available. + Details
Name: | omcl_ConcentrationRiskCustomerNumber
Namespace Prefix: | omcl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration