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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Basic earnings per share        
Net income attributable to Mistras Group, Inc. $ 4,373 $ 3,380 $ 3,653 $ 3,955
Denominator:        
Weighted average common shares outstanding (in shares) 29,965 29,619 29,879 29,550
Basic earnings per share (in dollars per share) $ 0.15 $ 0.11 $ 0.12 $ 0.13
Denominator:        
Weighted average common shares outstanding (in shares) 29,965 29,619 29,879 29,550
Dilutive effect of stock options outstanding (in shares) 0 0 0 0
Dilutive effect of restricted stock units outstanding (in shares) 280 508 330 543
Weighted average common shares outstanding, diluted (in shares) 30,245 30,127 30,209 30,093
Diluted earnings per share (in dollars per share) $ 0.14 $ 0.11 $ 0.12 $ 0.13