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Basis of Presentation - Other Loss, net (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Debt Instrument [Line Items]          
Loss on deconsolidation       $ 4,064 $ 0
Other Nonoperating Income       217  
Other loss, net $ (3,847)   $ 0 (3,502) $ 0
Hill International Brasil S.A.          
Debt Instrument [Line Items]          
Loss on deconsolidation       $ 4,064  
Secured Debt          
Debt Instrument [Line Items]          
Other loss, net   $ 345