Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
Increase (decrease) in stockholders' equity
Balance	$ 162,786
Net earnings	1,279	293
Other comprehensive loss	(9,489)
Comprehensive earnings	(8,210)
Additional paid in capital	763
Balance	155,339
Hill International, Inc. Stockholders - Stockholders' equity at the end of the period	147,791			154,112
Noncontrolling Interest - Stockholders' equity at the beginning of the period	8,674		7,548
Hill International, Inc. Stockholders
Increase (decrease) in stockholders' equity
Balance	154,112
Net earnings	1,095
Other comprehensive loss	(8,179)
Comprehensive earnings	(7,084)
Additional paid in capital	763
Balance	147,791
Noncontrolling Interests
Increase (decrease) in stockholders' equity
Balance	8,674
Net earnings	184
Other comprehensive loss	(1,310)
Comprehensive earnings	(1,126)
Balance	$ 7,548