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Earnings (loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Basic earnings (loss) per share    
Net income (loss) attributable to Mistras Group, Inc. $ 995 $ (4,986)
Denominator:    
Weighted-average common shares outstanding (in shares) 30,680 30,021
Basic earnings (loss) per share (in dollars per share) $ 0.03 $ (0.17)
Denominator:    
Weighted-average common shares outstanding (in shares) 30,680 30,021
Dilutive effect of stock options outstanding (in shares) 250 0
Dilutive effect of restricted stock units outstanding (in shares) 426 0
Weighted-average common shares outstanding, diluted (in shares) 31,356 30,021
Diluted earnings (loss) per share (in dollars per share) $ 0.03 $ (0.17)
Restricted Stock    
Denominator:    
Potentially dilutive shares excluded from computation of diluted EPS due to net loss for the period (in shares)   1,513