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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 3,893	$ (99,466)	$ 6,080
Other comprehensive income (loss):
Foreign currency translation adjustments	(4,252)	5,227	6,275
Comprehensive income (loss)	(359)	(94,239)	12,355
Less: net income (loss) attributable to noncontrolling interests, net of taxes	33	(5)	20
Less: Foreign currency translation adjustments attributable to noncontrolling interests	(2)	3	3
Comprehensive income (loss) attributable to Mistras Group, Inc.	$ (390)	$ (94,237)	$ 12,332

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