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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, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Basic earnings (loss) per share:                              
Net income (loss) attributable to Mistras Group, Inc. $ (2,514) $ (10,298) $ 337 $ (4,986) $ 2,842 $ 4,373 $ 4,643 $ (5,363) $ (94) $ 3,380 $ 5,937 $ (5,362) $ (17,453) $ 6,499 $ 3,860
Denominator                              
Weighted average common shares outstanding (in shares)                         30,330 29,901 29,572
Basic earnings (loss) per share (in dollars per share) $ (0.08) $ (0.34) $ 0.01 $ (0.17) $ 0.09 $ 0.15 $ 0.15 $ (0.18) $ 0 $ 0.11 $ 0.20 $ (0.18) $ (0.58) $ 0.22 $ 0.13
Denominator                              
Weighted average common shares outstanding (in shares)                         30,330 29,901 29,572
Dilutive effect of stock options outstanding (in shares)                         0 0 558
Dilutive effect of restricted stock units outstanding (in shares)                         0 328 0
Weighted average common shares outstanding, diluted (in shares)                         30,330 30,229 30,130
Diluted earnings (loss) per share (in dollars per share) $ (0.08) $ (0.34) $ 0.01 $ (0.17) $ 0.09 $ 0.14 $ 0.15 $ (0.18) $ 0 $ 0.11 $ 0.20 $ (0.18) $ (0.58) $ 0.21 $ 0.13