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Notes Payable and Long-Term Debt - Term Loan Facilities and Revolving Credit Facilities (Details)
1 Months Ended 9 Months Ended
Dec. 31, 2022
USD ($)
Nov. 30, 2022
USD ($)
Oct. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Apr. 01, 2020
USD ($)
lender
Apr. 01, 2020
EUR (€)
Jul. 31, 2021
Facility
subsidiary
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Apr. 01, 2020
EUR (€)
lender
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Debt Instrument [Line Items]                          
Payment of amendment fee         $ 463,000                
Minimum                          
Debt Instrument [Line Items]                          
Grace periods requiring interest-only monthly payments                 6 months        
Maximum                          
Debt Instrument [Line Items]                          
Grace periods requiring interest-only monthly payments                 1 year        
Corridor Rate                          
Debt Instrument [Line Items]                          
Basis spread on variable rate (as a percent)               1.00%          
Revolving Credit Facility | Other Assets                          
Debt Instrument [Line Items]                          
Unamortized debt issuance costs       $ 1,569,000         $ 1,569,000 $ 314,000      
Overdraft Facility With Arab Bank                          
Debt Instrument [Line Items]                          
Number of subsidiaries | subsidiary               1          
Number of facilities | Facility               2          
Secured Term Loan                          
Debt Instrument [Line Items]                          
Aggregate principal amount                       $ 30,000,000  
Secured Credit Facilities                          
Debt Instrument [Line Items]                          
Debt covenant leverage ratio limit                 3.00        
Increase in applicable interest rate upon default                 2.00%        
Hill International, Inc. - Société Générale 2017 Term Loan Facility                          
Debt Instrument [Line Items]                          
Reduction to credit commitments, amount       500,000                  
Hill International, Inc. - Société Générale 2017 Term Loan Facility | Forecast                          
Debt Instrument [Line Items]                          
Reduction to credit commitments, amount $ 3,000,000 $ 500,000 $ 500,000                    
U.S. Revolver | SOFR                          
Debt Instrument [Line Items]                          
Basis spread on variable rate (as a percent)                 4.85%        
U.S. Revolver | Base Rate                          
Debt Instrument [Line Items]                          
Basis spread on variable rate (as a percent)                 3.75%        
U.S. Revolver | Letter of Credit                          
Debt Instrument [Line Items]                          
Amounts outstanding       4,972,000         $ 4,972,000 6,457,000      
Available borrowing capacity       7,000         7,000 2,643,000      
U.S. Revolver | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Aggregate principal amount       28,282,000   $ 28,500,000     $ 28,282,000 28,500,000   25,000,000  
Number of lenders | lender           1         1    
Increase in aggregate principal amount           $ 3,500,000              
Unused facility commitment fees percentage                 0.50%        
U.S. Revolver | Revolving Credit Facility | Other Foreign Banks | Foreign credit agreements                          
Debt Instrument [Line Items]                          
Amounts outstanding       4,972,000         $ 4,972,000        
U.S. Revolver | Hill International, Inc. - Société Générale Domestic Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Line of credit, interest rate increase (percent)         1.10%                
International Revolver | EURIBOR                          
Debt Instrument [Line Items]                          
Basis spread on variable rate (as a percent)                 6.00%        
International Revolver | Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Maximum borrowing capacity           6,536,000           $ 10,000,000  
Unused facility commitment fees percentage                 0.75%        
International Revolver | Revolving Credit Facility | Foreign credit agreements                          
Debt Instrument [Line Items]                          
Available borrowing capacity       3,436,000         $ 3,436,000 5,980,000      
International Revolver | Revolving Credit Facility | Other Foreign Banks | Foreign credit agreements                          
Debt Instrument [Line Items]                          
Amounts outstanding       509,000         509,000 478,000      
Available borrowing capacity       175,000         175,000 520,000      
Maximum borrowing capacity       $ 5,568,000         5,568,000 6,800,000      
International Revolver | Hill International N.V.. - Société Générale International Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Line of credit, interest rate increase (percent)       1.50%                  
Revolving Credit Facility | Revolving Credit Facility Prior To Amendment                          
Debt Instrument [Line Items]                          
Maximum borrowing capacity | €                     € 5,977,000   € 9,156,000
Increase (decrease) in maximum borrowing capacity           $ 3,500,000 € 3,179,000            
Unsecured Debt | Hill International, Inc. - First Abu Dhabi Bank ("FAB") PJSC Overdraft Credit Facility                          
Debt Instrument [Line Items]                          
Available borrowing capacity       $ 436,000         436,000 $ 2,980,000      
Unsecured Debt | Hill International North Africa Ltd - Arab Bank                          
Debt Instrument [Line Items]                          
Amounts outstanding       0         0        
Available borrowing capacity       $ 3,000,000         $ 3,000,000        
Secured Debt | Hill International, Inc. - Société Générale 2017 Term Loan Facility                          
Debt Instrument [Line Items]                          
Line of credit, interest rate increase (percent)         1.00%