Document and Entity Information - shares
6 Months Ended
Jun. 30, 2016
Aug. 01, 2016
Document and Entity Information    
Entity Registrant Name Hill International, Inc.  
Entity Central Index Key 0001287808  
Document Type 10-Q  
Document Period End Date Jun. 30, 2016  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   51,748,900
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q2