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Earnings (loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Basic earnings (loss) per share:    
Net loss attributable to Mistras Group, Inc. $ (98,509) $ (5,293)
Denominator:    
Weighted-average common shares outstanding (in shares) 28,963 28,574
Basic earnings (loss) per share (in dollars per share) $ (3.40) $ (0.19)
Denominator:    
Weighted-average common shares outstanding (in shares) 28,963 28,574
Dilutive effect of stock options outstanding (in shares) 0 0
Dilutive effect of restricted stock units outstanding (in shares) 0 0
Weighted average common shares outstanding, diluted (in shares) 28,963 28,574
Diluted earnings (loss) per share (in dollars per share) $ (3.40) $ (0.19)