v3.8.0.1
Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2017
Mar. 12, 2018
Jun. 30, 2017
Document Information [Line Items]      
Entity Registrant Name INNERWORKINGS INC    
Entity Central Index Key 0001350381    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Trading Symbol INWK    
Entity Common Stock, Shares Outstanding   54,336,258  
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2017    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2017    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 524,995,340