Document and Entity Information - USD ($)
6 Months Ended
Jun. 30, 2018
Jul. 20, 2018
Jun. 30, 2016
Document And Entity Information [Abstract]      
Entity Registrant Name FLIR SYSTEMS INC    
Entity Central Index Key 0000354908    
Trading Symbol FLIR    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-Q    
Document Period End Date Jun. 30, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus Q2    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   138,019,573  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 4,711,497,291