Document And Entity Information - USD ($)
3 Months Ended
Mar. 31, 2019
May 06, 2019
Jun. 30, 2018
Document And Entity Information [Abstract]      
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   51,859,799  
Document Type 10-Q    
Amendment Flag false    
Entity Public Float     $ 319,588,359
Document Period End Date Mar. 31, 2019    
Document Fiscal Period Focus Q1    
Document Fiscal Year Focus 2019    
Entity Small Business false    
Entity Emerging Growth Company false