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Earnings per Share - Computations of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic earnings (loss) per share:                              
Net income (loss) attributable to Mistras Group, Inc. $ (94) $ 3,380 $ 5,937 $ (5,362) $ 181 $ 1,523 $ (2,656) $ (98,509) $ 829 $ 3,093 $ 7,431 $ (5,293) $ 3,860 $ (99,461) $ 6,060
Denominator                              
Weighted average common shares outstanding (in shares)                         29,572 29,147 28,740
Basic earnings (loss) per share (in dollars per share) $ (0.00) $ 0.11 $ 0.20 $ (0.18) $ 0.01 $ 0.05 $ (0.09) $ (3.40) $ 0.03 $ 0.11 $ 0.26 $ (0.19) $ 0.13 $ (3.41) $ 0.21
Denominator                              
Weighted average common shares outstanding (in shares)                         29,572 29,147 28,740
Dilutive effect of stock options outstanding (in shares)                         558 0 98
Dilutive effect of restricted stock units outstanding (in shares)                         0 0 208
Weighted average common shares outstanding, diluted (in shares)                         30,130 29,147 29,046
Diluted earnings (loss) per share (in dollars per share) $ (0.00) $ 0.11 $ 0.20 $ (0.18) $ 0.01 $ 0.05 $ (0.09) $ (3.40) $ 0.03 $ 0.11 $ 0.26 $ (0.19) $ 0.13 $ (3.41) $ 0.21