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Deferred Revenue (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Revenue Disclosure [Abstract] |  |
Short-term deferred revenue | $ 86,100 | $ 87,500
Deferred service revenue, cost of sales, current | 16,900 | 14,200
Long-term deferred revenue | $ 17,244 | $ 17,051

X
- Definition Deferred Cost of Services, Current + References No definition available. + Details
Name: | omcl_DeferredCostofServicesCurrent
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Deferred Revenue, Services, Current + References No definition available. + Details
Name: | omcl_DeferredRevenueServicesCurrent
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deferred Revenue, Services, Noncurrent + References No definition available. + Details
Name: | omcl_DeferredRevenueServicesNoncurrent
Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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