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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)	6 Months Ended
	Jun. 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%

X

- 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

X

- Details

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