Segment Information - Percentage of Total Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue from External Customer [Line Items]
Revenues	$ 398,262	$ 330,692
Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	76,721	70,951
Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	93,635	83,077
Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	62,667	48,461
Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	52,966	36,744
Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	42,907	36,157
Fall Protection
Revenue from External Customer [Line Items]
Revenues	31,157	24,662
Other
Revenue from External Customer [Line Items]
Revenues	$ 38,209	$ 30,640
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	19.00%	22.00%
Revenue Benchmark | Fixed Gas & Flame Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	24.00%	25.00%
Revenue Benchmark | Firefighter Helmets & Protective Apparel | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	16.00%	15.00%
Revenue Benchmark | Portable Gas Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	13.00%	11.00%
Revenue Benchmark | Industrial Head Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	11.00%	11.00%
Revenue Benchmark | Fall Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	7.00%
Revenue Benchmark | Other | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	9.00%	9.00%
Americas
Revenue from External Customer [Line Items]
Revenues	$ 280,267	$ 225,648
Americas | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	52,769	50,398
Americas | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	61,143	54,621
Americas | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	49,287	33,476
Americas | Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	38,168	25,791
Americas | Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	33,625	28,165
Americas | Fall Protection
Revenue from External Customer [Line Items]
Revenues	20,458	16,277
Americas | Other
Revenue from External Customer [Line Items]
Revenues	$ 24,817	$ 16,920
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	19.00%	22.00%
Americas | Revenue Benchmark | Fixed Gas & Flame Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	22.00%	24.00%
Americas | Revenue Benchmark | Firefighter Helmets & Protective Apparel | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	18.00%	15.00%
Americas | Revenue Benchmark | Portable Gas Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	14.00%	11.00%
Americas | Revenue Benchmark | Industrial Head Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	13.00%
Americas | Revenue Benchmark | Fall Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	7.00%	7.00%
Americas | Revenue Benchmark | Other | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	8.00%
International
Revenue from External Customer [Line Items]
Revenues	$ 117,995	$ 105,044
International | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	23,952	20,553
International | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	32,492	28,456
International | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	13,380	14,985
International | Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	14,798	10,953
International | Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	9,282	7,992
International | Fall Protection
Revenue from External Customer [Line Items]
Revenues	10,699	8,385
International | Other
Revenue from External Customer [Line Items]
Revenues	$ 13,392	$ 13,720
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	20.00%	20.00%
International | Revenue Benchmark | Fixed Gas & Flame Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	28.00%	27.00%
International | Revenue Benchmark | Firefighter Helmets & Protective Apparel | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	11.00%	14.00%
International | Revenue Benchmark | Portable Gas Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	13.00%	10.00%
International | Revenue Benchmark | Industrial Head Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	8.00%
International | Revenue Benchmark | Fall Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	9.00%	8.00%
International | Revenue Benchmark | Other | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	11.00%	13.00%