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Deferred Gross Profit - Additional Information (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Total deferred gross profit | $ 27,179 | $ 28,558
Products with Installation Services [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Sales of medication and supply dispensing systems including packaging equipment | 44,158 | 36,947
Less: cost of revenues, excluding installation costs | (16,979) | (8,389)
Total deferred gross profit | $ 27,179 | $ 28,558

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- Definition Cost of Goods Sold, Equipment Net of Installation + References No definition available. + Details
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Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Sales of Revenues, Goods, Equipment + References No definition available. + Details
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Namespace Prefix: | omcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |