Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Nov. 03, 2011
Jun. 30, 2010
Document and Entity Information [Abstract]      
Entity Registrant Name INSULET CORP    
Entity Central Index Key 0001145197    
Document Type 10-Q    
Document Period End Date Sep. 30, 2011    
Amendment Flag false    
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus Q3    
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     $ 570.6
Entity Common Stock, Shares Outstanding   47,393,824