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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
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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

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