Segment Information - Percentage of Total Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue from External Customer [Line Items]
Revenues	$ 413,302	$ 398,262
Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	163,694	139,388
Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	139,216	146,601
Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	$ 110,392	$ 112,273
Revenue Benchmark | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%
Revenue Benchmark | Breathing Apparatus | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	40.00%	35.00%
Revenue Benchmark | Fixed Gas & Flame Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	34.00%	37.00%
Revenue Benchmark | Firefighter Helmets & Protective Apparel | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	26.00%	28.00%
Americas
Revenue from External Customer [Line Items]
Revenues	$ 295,539	$ 280,267
Americas | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	122,252	102,056
Americas | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	96,295	99,311
Americas | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	$ 76,992	$ 78,900
Americas | Revenue Benchmark | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%
Americas | Revenue Benchmark | Breathing Apparatus | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	41.00%	36.00%
Americas | Revenue Benchmark | Fixed Gas & Flame Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	33.00%	35.00%
Americas | Revenue Benchmark | Firefighter Helmets & Protective Apparel | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	26.00%	29.00%
International
Revenue from External Customer [Line Items]
Revenues	$ 117,763	$ 117,995
International | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	41,442	37,332
International | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	42,921	47,290
International | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	$ 33,400	$ 33,373
International | Revenue Benchmark | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%
International | Revenue Benchmark | Breathing Apparatus | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	35.00%	32.00%
International | Revenue Benchmark | Fixed Gas & Flame Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	36.00%	40.00%
International | Revenue Benchmark | Firefighter Helmets & Protective Apparel | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	29.00%	28.00%