CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) earnings	$ (1,936)	$ 1,700	$ (8,358)	$ (368)
Foreign currency translation adjustment, net of tax	5,001	980	4,746	(874)
Comprehensive earnings (loss)	3,065	2,680	(3,612)	(1,242)
Less: Comprehensive (loss) earnings attributable to noncontrolling interests	(173)	195	(173)	214
Comprehensive earnings (loss) attributable to Hill International, Inc.	$ 3,238	$ 2,485	$ (3,439)	$ (1,456)