Document and Entity Information Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Aug. 01, 2012
Jun. 30, 2011
Entity Information [Line Items]      
Entity Registrant Name OMNICELL, Inc    
Entity Central Index Key 0000926326    
Document Type 10-Q    
Document Period End Date Jun. 30, 2012    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 497.7
Entity Common Stock, Shares Outstanding   33,301,933  
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus Q2