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Deferred Gross Profit - Additional Information (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Total deferred gross profit | $ 28,558 omcl_DeferredRevenueGoods | $ 19,957 omcl_DeferredRevenueGoods
Products with Installation Services [Member] |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |
Sales of medication and supply dispensing systems including packaging equipment | 36,947 omcl_SalesofRevenuesGoodsEquipment / us-gaap_DeferredRevenueArrangementTypeAxis = omcl_ProductswithInstallationServicesMember | 29,040 omcl_SalesofRevenuesGoodsEquipment / us-gaap_DeferredRevenueArrangementTypeAxis = omcl_ProductswithInstallationServicesMember
Less: cost of revenues, excluding installation costs | (8,389)omcl_CostofGoodsSoldEquipmentNetofInstallation / us-gaap_DeferredRevenueArrangementTypeAxis = omcl_ProductswithInstallationServicesMember | (9,083)omcl_CostofGoodsSoldEquipmentNetofInstallation / us-gaap_DeferredRevenueArrangementTypeAxis = omcl_ProductswithInstallationServicesMember
Total deferred gross profit | $ 28,558 omcl_DeferredRevenueGoods / us-gaap_DeferredRevenueArrangementTypeAxis = omcl_ProductswithInstallationServicesMember | $ 19,957 omcl_DeferredRevenueGoods / us-gaap_DeferredRevenueArrangementTypeAxis = omcl_ProductswithInstallationServicesMember

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