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Selected Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 171,163	$ 174,556	$ 177,677	$ 153,735	$ 160,777	$ 147,894	$ 124,435	$ 159,465	$ 178,991	$ 192,192	$ 200,616	$ 176,787	$ 677,131	$ 592,571	$ 748,586
Gross Profit	49,594	52,216	55,336	40,001	49,345	47,384	41,158	40,644	50,583	57,769	60,071	48,874	197,147	178,531	217,297
Income (loss) from operations	2,306	9,236	11,374	(4,746)	4,652	5,742	(383)	(111,228)	2,335	10,779	15,419	(4,396)	18,170	(101,217)	24,137
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
Earnings (loss) per common share:
Basic (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
Diluted (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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