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Capital Stock - Schedule of Common Stock Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Common Stock Activity [Roll Forward] |  |  |  |
Beginning balance (in shares) | 39,213,064 |  |  |
Stock options exercised (in shares) | 31,394 | 103,545 | 122,087 |
Ending balance (in shares) | 39,317,212 | 39,213,064 |  |
Common stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Beginning balance (in shares) | 62,081,391 | 62,081,391 | 62,081,391 |
Acquisition of noncontrolling interest |  |  | $ (4,751) |
Ending balance (in shares) | 62,081,391 | 62,081,391 | 62,081,391 |
Total MSA Safety Incorporated shareholders’ equity | $ 312,324 | $ 281,980 | $ 260,121 | $ 242,693
Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Beginning balance (in shares) | 22,868,327 | 22,804,873 | 23,013,489 |
Ending balance (in shares) | 22,764,179 | 22,868,327 | 22,804,873 |
Total MSA Safety Incorporated shareholders’ equity | $ (361,684) | $ (359,838) | $ (328,776) | $ (326,156)
Restricted Stock | Common stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Restricted stock awards | (643) | (711) | (762) |
Restricted stock expense | 9,476 | 7,715 | 6,562 |
Restricted stock forfeitures | $ (1,414) | $ (1,227) | $ (765) |
Restricted Stock | Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Restricted stock awards (in shares) | 40,856 | 52,810 | 53,934 |
Restricted stock awards | $ 643 | $ 711 | $ 762 |
Stock options | Common stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Restricted stock expense | 11 | 49 | 90 |
Restricted stock forfeitures | (11) |  | (9) |
Stock options exercised | $ 970 | $ 3,021 | $ 4,003 |
Stock options | Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Stock options exercised (in shares) | 31,394 | 103,545 | 122,119 |
Stock options exercised | $ 503 | $ 1,629 | $ 1,767 |
Performance stock | Common stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Restricted stock expense | 23,546 | 15,843 | 13,227 |
Restricted stock forfeitures | (1,585) | (2,730) |  |
Performance stock issued | $ (855) | $ (880) | $ (939) |
Performance stock | Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Performance stock issued (in shares) | 53,407 | 55,447 | 64,543 |
Performance stock issued | $ 855 | $ 880 | $ 939 |
Employee Stock Purchase Plan | Common stock |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Employee stock purchase plan | $ 849 | $ 779 | $ 772 |
Employee Stock Purchase Plan | Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Employee stock purchase plan (in shares) | 7,140 | 7,412 | 5,730 |
Employee stock purchase plan | $ 114 | $ 112 | $ 83 |
Treasury shares purchased | Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Purchase of treasury shares (in shares) | (28,649) | (31,260) | (37,710) |
Treasury shares purchased | $ (3,961) | $ (4,021) | $ (6,171) |
Share repurchase program | Treasury Stock, Common |  |  |  |
Common Stock Activity [Roll Forward] |  |  |  |
Purchase of treasury shares (in shares) |  | (251,408) |  |
Treasury shares purchased |  | $ (30,373) |  |

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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |