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Earnings (loss) per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Basic earnings (loss) per share        
Net income (loss) attributable to Mistras Group, Inc. $ 6,369 $ 337 $ 7,364 $ (4,649)
Denominator:        
Weighted average common shares outstanding, basic (in shares) 30,979,000 30,368,000 30,842,000 30,214,000
Basic earnings (loss) per share (in dollars per share) $ 0.21 $ 0.01 $ 0.24 $ (0.15)
Denominator:        
Weighted average common shares outstanding, basic (in shares) 30,979,000 30,368,000 30,842,000 30,214,000
Dilutive effect of stock options outstanding (in shares) 97,000 0 93,000 0
Dilutive effect of restricted stock units outstanding (in shares) 217,000 292,000 423,000 0
Weighted average common shares outstanding, diluted (in shares) 31,293,000 30,660,000 31,358,000 30,214,000
Diluted earnings (loss) per share (in dollars per share) $ 0.20 $ 0.01 $ 0.23 $ (0.15)
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)       1,106,595