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Earnings (loss) per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Basic earnings (loss) per share        
Net income (loss) attributable to Mistras Group, Inc. $ (10,298) $ 4,373 $ (14,947) $ 3,653
Denominator:        
Weighted average common shares outstanding, basic (in shares) 30,402,000 29,965,000 30,277,000 29,879,000
Basic earnings (loss) per share (in dollars per share) $ (0.34) $ 0.15 $ (0.49) $ 0.12
Denominator:        
Weighted average common shares outstanding, basic (in shares) 30,402,000 29,965,000 30,277,000 29,879,000
Dilutive effect of restricted stock units outstanding (in shares) 0 280,000 0 330,000
Weighted average common shares outstanding, diluted (in shares) 30,402,000 30,245,000 30,277,000 30,209,000
Diluted earnings (loss) per share (in dollars per share) $ (0.34) $ 0.14 $ (0.49) $ 0.12
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 income (loss) for the period (in shares) 1,508,255   926,224