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Earnings (loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Basic loss per share    
Net loss attributable to Mistras Group, Inc. $ (4,986) $ (5,363)
Denominator:    
Weighted-average common shares outstanding (in shares) 30,021 29,634
Basic loss per share (in dollars per share) $ (0.17) $ (0.18)
Denominator:    
Weighted-average common shares outstanding (in shares) 30,021 29,634
Dilutive effect of restricted stock units outstanding (in shares) 0 0
Weighted-average common shares outstanding, diluted (in shares) 30,021 29,634
Diluted loss per share (in dollars per share) $ (0.17) $ (0.18)
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) 1,513 1,212