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Segment Information - Revenue from External Customers by Products and Services (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 388,248 | $ 304,392 | $ 314,438 | $ 341,145 | $ 375,254 | $ 351,014 | $ 349,675 | $ 326,038 | $ 1,348,223 | $ 1,401,981 | $ 1,358,104
Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Breathing Apparatus |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 329,179 | $ 317,678 | $ 324,672
Breathing Apparatus | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 24.00% | 23.00% | 24.00%
Fixed Gas and Flame Detection |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 287,414 | $ 292,988 | $ 262,432
Fixed Gas and Flame Detection | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 19.00%
Fire Helmets & Protective Apparel |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 162,207 | $ 178,012 | $ 169,679
Fire Helmets & Protective Apparel | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 12.00% | 13.00% | 13.00%
Portable Gas Detection |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 142,581 | $ 169,479 | $ 163,716
Portable Gas Detection | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 11.00% | 12.00% | 12.00%
Head Protection |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 125,921 | $ 145,403 | $ 146,388
Head Protection | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 9.00% | 10.00% | 11.00%
Fall Protection |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 103,075 | $ 125,869 | $ 109,472
Fall Protection | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 8.00% | 9.00% | 8.00%
Other |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 197,846 | $ 172,552 | $ 181,745
Other | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 15.00% | 12.00% | 13.00%
Americas |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 874,305 | $ 915,118 | $ 854,287
Americas | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Americas | Breathing Apparatus |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 220,650 | $ 212,463 | $ 205,100
Americas | Breathing Apparatus | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 25.00% | 23.00% | 24.00%
Americas | Fixed Gas and Flame Detection |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 158,924 | $ 159,892 | $ 135,922
Americas | Fixed Gas and Flame Detection | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 18.00% | 17.00% | 16.00%
Americas | Fire Helmets & Protective Apparel |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 133,653 | $ 142,043 | $ 136,794
Americas | Fire Helmets & Protective Apparel | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 15.00% | 16.00% | 16.00%
Americas | Portable Gas Detection |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 90,545 | $ 113,914 | $ 109,401
Americas | Portable Gas Detection | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 10.00% | 12.00% | 13.00%
Americas | Head Protection |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 92,075 | $ 112,673 | $ 114,465
Americas | Head Protection | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 11.00% | 12.00% | 13.00%
Americas | Fall Protection |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 58,060 | $ 78,054 | $ 61,289
Americas | Fall Protection | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 7.00% | 9.00% | 7.00%
Americas | Other |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 120,398 | $ 96,079 | $ 91,316
Americas | Other | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 14.00% | 11.00% | 11.00%
International |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 473,918 | $ 486,863 | $ 503,817
International | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
International | Breathing Apparatus |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 108,529 | $ 105,215 | $ 119,572
International | Breathing Apparatus | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 23.00% | 22.00% | 24.00%
International | Fixed Gas and Flame Detection |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 128,490 | $ 133,096 | $ 126,510
International | Fixed Gas and Flame Detection | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 27.00% | 27.00% | 25.00%
International | Fire Helmets & Protective Apparel |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 28,554 | $ 35,969 | $ 32,885
International | Fire Helmets & Protective Apparel | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 6.00% | 7.00% | 6.00%
International | Portable Gas Detection |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 52,036 | $ 55,565 | $ 54,315
International | Portable Gas Detection | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 11.00% | 11.00% | 11.00%
International | Head Protection |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 33,846 | $ 32,730 | $ 31,923
International | Head Protection | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 7.00% | 7.00% | 6.00%
International | Fall Protection |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 45,015 | $ 47,815 | $ 48,183
International | Fall Protection | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00%
International | Other |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 77,448 | $ 76,473 | $ 90,429
International | Other | Sales |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk (percentage) |  |  |  |  |  |  |  |  | 16.00% | 16.00% | 18.00%

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