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Earnings (loss) per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Basic earnings (loss) per share        
Net income (loss) attributable to Mistras Group, Inc. $ 6,401 $ (10,298) $ 13,765 $ (14,947)
Denominator:        
Weighted average common shares outstanding, basic (in shares) 31,002,000 30,402,000 30,895,000 30,277,000
Basic earnings (loss) per share (in dollars per share) $ 0.21 $ (0.34) $ 0.45 $ (0.49)
Numerator:        
Net income (loss) attributable to Mistras Group, Inc. $ 6,401 $ (10,298) $ 13,765 $ (14,947)
Denominator:        
Weighted average common shares outstanding, basic (in shares) 31,002,000 30,402,000 30,895,000 30,277,000
Dilutive effect of stock options outstanding (in shares) 120,000 0 103,000 0
Dilutive effect of restricted stock units outstanding (in shares) 538,000 0 515,000 0
Weighted average common shares outstanding, diluted (in shares) 31,660,000 30,402,000 31,513,000 30,277,000
Diluted earnings (loss) per share (in dollars per share) $ 0.20 $ (0.34) $ 0.44 $ (0.49)
Restricted Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive shares excluded from computation of diluted EPS due to net loss for the period (in shares)     1,508,255 926,224