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Selected Quarterly Financial Information (unaudited) (Details) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                              
Revenue $ 182,073 $ 179,354 $ 176,030 $ 168,016 $ 168,218 $ 178,462 $ 179,031 $ 161,662 $ 171,163 $ 174,556 $ 177,677 $ 153,735 $ 705,473 $ 687,373 $ 677,131
Gross Profit 53,627 54,382 49,722 46,077 50,939 53,784 53,558 39,892 49,594 52,216 55,336 40,001 203,807 198,173 197,147
Income (loss) from operations 706 (4,682) 3,893 (1,830) 5,802 9,114 9,576 (4,698) 2,306 9,236 11,374 (4,746) (1,904) 19,799 18,170
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
Earnings (loss) per common share:                              
Basic (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
Diluted (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