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Capital Stock - Schedule of Common Stock Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Common Stock Activity [Roll Forward] |  |  |  |
Beginning balance (in shares) | 39,317,212 |  |  |
Stock options exercised (in shares) | 10,666 | 31,394 | 103,545 |
Employee stock purchase plan expense | $ 186 |  |  |
Ending balance (in shares) | 39,260,080 | 39,317,212 |  |
Common stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Beginning balance (in shares) | 62,081,391 | 62,081,391 | 62,081,391 |
Ending balance (in shares) | 62,081,391 | 62,081,391 | 62,081,391 |
Total MSA Safety Incorporated shareholders’ equity | $ 329,953 | $ 312,324 | $ 281,980 | $ 260,121
Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Beginning balance (in shares) | 22,764,179 | 22,868,327 | 22,804,873 |
Ending balance (in shares) | 22,821,311 | 22,764,179 | 22,868,327 |
Total MSA Safety Incorporated shareholders’ equity | $ (396,604) | $ (361,684) | $ (359,838) | $ (328,776)
Restricted Stock | Common stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Restricted stock awards | (842) | (643) | (711) |
Restricted stock expense | 15,769 | 9,476 | 7,715 |
Restricted stock forfeitures | $ (4,530) | $ (1,414) | $ (1,227) |
Restricted Stock | Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Restricted stock awards (in shares) | 52,098 | 40,856 | 52,810 |
Restricted stock awards | $ 842 | $ 643 | $ 711 |
Stock options | Common stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Restricted stock expense | 41 | 11 | 49 |
Restricted stock forfeitures | (41) | (11) |  |
Stock options exercised | $ 327 | $ 970 | $ 3,021 |
Stock options | Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Stock options exercised (in shares) | 10,666 | 31,394 | 103,545 |
Stock options exercised | $ 174 | $ 503 | $ 1,629 |
Performance stock | Common stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Restricted stock expense | 8,394 | 23,546 | 15,843 |
Restricted stock forfeitures | (1,634) | (1,585) | (2,730) |
Performance stock issued | $ (1,256) | $ (855) | $ (880) |
Performance stock | Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Performance stock issued (in shares) | 77,544 | 53,407 | 55,447 |
Performance stock issued | $ 1,256 | $ 855 | $ 880 |
Employee Stock Purchase Plan | Common stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Employee stock purchase plan shares issued | $ 1,215 | $ 849 | $ 779 |
Employee Stock Purchase Plan | Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Employee stock purchase plan (in shares) | 8,871 | 7,140 | 7,412 |
Employee stock purchase plan shares issued | $ 148 | $ 114 | $ 112 |
Treasury shares purchased | Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Purchase of treasury shares (in shares) | 40,019 | 28,649 | 31,260 |
Treasury shares purchased | $ (7,408) | $ (3,961) | $ (4,021) |
Share repurchase program | Common stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Purchase of treasury shares (in shares) | 0 |  |  |
Treasury shares purchased | $ 0 |  |  |
Share Repurchase Program | Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Restricted stock expense | $ (29,932) |  | $ (30,373) |
Purchase of treasury shares (in shares) | (166,292) |  | (251,408) |

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