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Earnings (loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic income (loss) per share        
Net income (loss) attributable to Mistras Group, Inc. $ 3,380 $ 1,523 $ 3,955 $ (99,642)
Denominator:        
Weighted-average common shares outstanding (in shares) 29,619 29,177 29,550 29,086
Basic income (loss) per share (in dollars per share) $ 0.11 $ 0.05 $ 0.13 $ (3.43)
Denominator:        
Weighted-average common shares outstanding (in shares) 29,619 29,177 29,550 29,086
Dilutive effect of stock options outstanding (in shares) 0 0 0 0
Dilutive effect of restricted stock units outstanding (in shares) 508 134 543 0
Weighted average common shares outstanding, diluted (in shares) 30,127 29,311 30,093 29,086
Diluted income (loss) per share (in dollars per share) $ 0.11 $ 0.05 $ 0.13 $ (3.43)
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)       213