CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ 2,245	$ 2,507	$ (6,113)	$ 2,139
Foreign currency translation adjustment, net of tax	639	(237)	5,385	(1,111)
Comprehensive earnings (loss)	2,884	2,270	(728)	1,028
Less: Comprehensive earnings attributable to noncontrolling interests	376	32	203	246
Comprehensive earnings (loss) attributable to Hill International, Inc.	$ 2,508	$ 2,238	$ (931)	$ 782