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Stock Option Plans and Share-Based Compensation - Percent of PSUs Granted (Details) (PSU Program Year Three, Performance-Based Restricted Stock Units) | 9 Months Ended
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Sep. 30, 2014
Below the 35th percentile |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
PSU percentage eligible for time-based vesting | 0.00%
At least the 35th percentile, but below the 50th percentile |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
PSU percentage eligible for time-based vesting | 50.00%
At least the 50th percentile |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
PSU percentage eligible for time-based vesting | 100.00%

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- Definition PSU percentage eligible for time-based vesting = the percentage of the original PSU award which will continue with service-based vesting based on the percentile ranking against total stock performance in the reference year for the health care index. + References No definition available. + Details
Name: | omcl_PsuPercentageEligibleForTimeBasedVesting
Namespace Prefix: | omcl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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