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Selected Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 168,218	$ 178,462	$ 179,031	$ 161,662	$ 171,163	$ 174,556	$ 177,677	$ 153,735	$ 160,777	$ 147,894	$ 124,435	$ 159,465	$ 687,373	$ 677,131	$ 592,571
Gross Profit	50,939	53,784	53,558	39,892	49,594	52,216	55,336	40,001	49,345	47,384	41,158	40,644	198,173	197,147	178,531
Income (loss) from operations	5,802	9,114	9,576	(4,698)	2,306	9,236	11,374	(4,746)	4,652	5,742	(383)	(111,228)	19,799	18,170	(101,217)
Net income (loss) attributable to Mistras Group, Inc.	$ 2,842	$ 4,373	$ 4,643	$ (5,363)	$ (94)	$ 3,380	$ 5,937	$ (5,362)	$ 181	$ 1,523	$ (2,656)	$ (98,509)	$ 6,499	$ 3,860	$ (99,461)
Earnings (loss) per common share:
Basic (in dollars per share)	$ 0.09	$ 0.15	$ 0.15	$ (0.18)	$ 0.00	$ 0.11	$ 0.20	$ (0.18)	$ 0.01	$ 0.05	$ (0.09)	$ (3.40)	$ 0.22	$ 0.13	$ (3.41)
Diluted (in dollars per share)	$ 0.09	$ 0.14	$ 0.15	$ (0.18)	$ 0.00	$ 0.11	$ 0.20	$ (0.18)	$ 0.01	$ 0.05	$ (0.09)	$ (3.40)	$ 0.21	$ 0.13	$ (3.41)

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