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Earnings per Share - Computations of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Basic earnings (loss) per share:      
Net income (loss) attributable to Mistras Group, Inc. $ 18,958 $ (17,453) $ 6,499
Denominator      
Weighted average common shares outstanding (in shares) 30,926 30,330 29,901
Basic earnings (loss) per share (in dollars per share) $ 0.61 $ (0.58) $ 0.22
Numerator:      
Net income (loss) attributable to Mistras Group, Inc. $ 18,958 $ (17,453) $ 6,499
Denominator      
Weighted average common shares outstanding (in shares) 30,926 30,330 29,901
Dilutive effect of stock options outstanding (in shares) 106 0
Dilutive effect of restricted stock units outstanding (in shares) 576 0 328
Weighted average common shares outstanding, diluted (in shares) 31,608 30,330 30,229
Diluted earnings (loss) per share (in dollars per share) $ 0.60 $ (0.58) $ 0.21