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Earnings (loss) per Share
 6 Months Ended
Jun. 30, 2025
Earnings Per Share [Abstract]  
Earnings (loss) per Share Earnings (loss) per Share
 
Basic earnings (loss) per share is computed by dividing net income (loss) by the weighted-average number of shares outstanding during the period. Diluted earnings (loss) per share is computed by dividing net income (loss) by the sum of (1) the weighted-average number of shares of common stock outstanding during the period, and (2) the dilutive effect of assumed conversion of equity awards using the treasury stock method. With respect to the number of weighted-average shares outstanding (denominator), diluted shares reflect: (i) the exercise of options to acquire common stock to the extent that the options’ exercise prices are less than the average market price of common shares during the period and (ii) the pro forma vesting of restricted stock units.
 
The following table sets forth the computations of basic and diluted earnings (loss) per share:
 
 Three months ended June 30,Six months ended June 30,
 2025202420252024
Basic earnings (loss) per share
Numerator:
Net income (loss) attributable to Mistras Group, Inc.$3,017 $6,369 $(169)$7,364 
Denominator:
Weighted average common shares outstanding31,439 30,979 31,268 30,842 
Basic earnings (loss) per share$0.10 $0.21 $— $0.24 
Diluted earnings (loss) per share:
Numerator:
Net income (loss) attributable to Mistras Group, Inc.$3,017 $6,369 $(169)$7,364 
Denominator:
Weighted average common shares outstanding31,439 30,979 31,268 30,842 
Dilutive effect of stock options outstanding (1)
91 97 — 93 
Dilutive effect of restricted stock units outstanding (1)
163 217 — 423 
31,693 31,293 31,268 31,358 
Diluted earnings (loss) per share$0.10 $0.20 $— $0.23 
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(1) For the three months ended June 30, 2025, 375,000 shares, related to stock options and 877,000 shares, related to restricted stock units were anti-dilutive and therefore were excluded from the calculation of diluted earnings (loss) per share. For the six months ended June 30, 2025, 106,000 shares, related to stock options and 867,000 shares, related to restricted stock units were excluded from the calculation of diluted earnings (loss) per share due to the net loss for the period.