Segment Information - Percentage of Total Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue from External Customer [Line Items]
Revenues	$ 447,299	$ 372,313	$ 845,561	$ 703,005
Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	101,231	91,950	177,952	162,901
Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	105,855	80,498	199,490	163,575
Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	65,259	47,899	127,926	96,360
Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	52,387	44,892	105,353	81,635
Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	47,164	43,724	90,071	79,881
Fall Protection
Revenue from External Customer [Line Items]
Revenues	33,882	26,614	65,039	51,275
Other
Revenue from External Customer [Line Items]
Revenues	$ 41,521	$ 36,736	$ 79,730	$ 67,378
Revenue Benchmark | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Revenue Benchmark | Breathing Apparatus | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	23.00%	25.00%	21.00%	23.00%
Revenue Benchmark | Fixed Gas & Flame Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	24.00%	22.00%	24.00%	23.00%
Revenue Benchmark | Firefighter Helmets & Protective Apparel | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	15.00%	13.00%	15.00%	14.00%
Revenue Benchmark | Portable Gas Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	12.00%	12.00%	12.00%
Revenue Benchmark | Industrial Head Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	10.00%	12.00%	11.00%	11.00%
Revenue Benchmark | Fall Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	7.00%	7.00%	8.00%	7.00%
Revenue Benchmark | Other | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	9.00%	9.00%	9.00%	10.00%
Americas
Revenue from External Customer [Line Items]
Revenues	$ 308,378	$ 252,386	$ 588,645	$ 478,034
Americas | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	69,268	64,610	122,037	115,008
Americas | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	66,387	50,514	127,530	105,135
Americas | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	51,889	35,037	101,176	68,513
Americas | Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	37,987	31,665	76,155	57,456
Americas | Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	36,092	34,023	69,717	62,188
Americas | Fall Protection
Revenue from External Customer [Line Items]
Revenues	22,475	17,005	42,933	33,282
Americas | Other
Revenue from External Customer [Line Items]
Revenues	$ 24,280	$ 19,532	$ 49,097	$ 36,452
Americas | Revenue Benchmark | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Americas | Revenue Benchmark | Breathing Apparatus | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	22.00%	26.00%	21.00%	24.00%
Americas | Revenue Benchmark | Fixed Gas & Flame Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	22.00%	20.00%	22.00%	22.00%
Americas | Revenue Benchmark | Firefighter Helmets & Protective Apparel | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	17.00%	14.00%	17.00%	14.00%
Americas | Revenue Benchmark | Portable Gas Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	13.00%	13.00%	12.00%
Americas | Revenue Benchmark | Industrial Head Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	13.00%	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%	7.00%	7.00%
Americas | Revenue Benchmark | Other | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	7.00%	8.00%	8.00%
International
Revenue from External Customer [Line Items]
Revenues	$ 138,921	$ 119,927	$ 256,916	$ 224,971
International | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	31,963	27,340	55,915	47,893
International | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	39,468	29,984	71,960	58,440
International | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	13,370	12,862	26,750	27,847
International | Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	14,400	13,227	29,198	24,179
International | Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	11,072	9,701	20,354	17,693
International | Fall Protection
Revenue from External Customer [Line Items]
Revenues	11,407	9,609	22,106	17,993
International | Other
Revenue from External Customer [Line Items]
Revenues	$ 17,241	$ 17,204	$ 30,633	$ 30,926
International | Revenue Benchmark | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
International | Revenue Benchmark | Breathing Apparatus | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	23.00%	23.00%	22.00%	21.00%
International | Revenue Benchmark | Fixed Gas & Flame Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	29.00%	25.00%	28.00%	26.00%
International | Revenue Benchmark | Firefighter Helmets & Protective Apparel | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	10.00%	11.00%	10.00%	12.00%
International | Revenue Benchmark | Portable Gas Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	10.00%	11.00%	11.00%	11.00%
International | Revenue Benchmark | Industrial Head Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	8.00%	8.00%	8.00%
International | Revenue Benchmark | Fall Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	8.00%	9.00%	8.00%
International | Revenue Benchmark | Other | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	14.00%	12.00%	14.00%