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Segment Information - Percentage of Total Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue from External Customer [Line Items]
Revenues	$ 340,197	$ 304,392	$ 989,915	$ 959,975
Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	70,790	62,454	217,094	214,162
Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	79,786	70,038	204,825	205,334
Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	49,366	38,785	148,497	121,669
Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	41,853	32,701	118,102	102,138
Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	36,764	29,328	107,615	95,260
Fall Protection
Revenue from External Customer [Line Items]
Revenues	28,223	24,620	85,098	73,707
Other
Revenue from External Customer [Line Items]
Revenues	$ 33,415	$ 46,466	$ 108,684	$ 147,705
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	21.00%	20.00%	22.00%	22.00%
Revenue Benchmark | Fixed Gas & Flame Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	23.00%	23.00%	21.00%	21.00%
Revenue Benchmark | Firefighter Helmets & Protective Apparel | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	15.00%	13.00%	15.00%	13.00%
Revenue Benchmark | Portable Gas Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	12.00%	11.00%	12.00%	11.00%
Revenue Benchmark | Industrial Head Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	11.00%	10.00%	11.00%	10.00%
Revenue Benchmark | Fall Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	8.00%	9.00%	8.00%
Revenue Benchmark | Other | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	10.00%	15.00%	10.00%	15.00%
Americas
Revenue from External Customer [Line Items]
Revenues	$ 229,076	$ 194,303	$ 655,123	$ 629,787
Americas | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	46,095	38,889	146,329	141,850
Americas | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	53,787	39,411	127,014	117,399
Americas | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	34,101	33,000	105,513	101,857
Americas | Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	29,186	20,972	80,281	65,822
Americas | Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	28,982	21,489	82,913	69,549
Americas | Fall Protection
Revenue from External Customer [Line Items]
Revenues	17,743	13,109	51,093	42,185
Americas | Other
Revenue from External Customer [Line Items]
Revenues	$ 19,182	$ 27,433	$ 61,980	$ 91,125
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	20.00%	20.00%	22.00%	23.00%
Americas | Revenue Benchmark | Fixed Gas & Flame Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	23.00%	20.00%	19.00%	19.00%
Americas | Revenue Benchmark | Firefighter Helmets & Protective Apparel | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	15.00%	17.00%	16.00%	16.00%
Americas | Revenue Benchmark | Portable Gas Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	13.00%	11.00%	12.00%	10.00%
Americas | Revenue Benchmark | Industrial Head Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	13.00%	11.00%	13.00%	11.00%
Americas | Revenue Benchmark | Fall Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	7.00%	8.00%	7.00%
Americas | Revenue Benchmark | Other | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	8.00%	14.00%	10.00%	14.00%
International
Revenue from External Customer [Line Items]
Revenues	$ 111,121	$ 110,089	$ 334,792	$ 330,188
International | Breathing Apparatus
Revenue from External Customer [Line Items]
Revenues	24,695	23,565	70,765	72,312
International | Fixed Gas & Flame Detection
Revenue from External Customer [Line Items]
Revenues	25,999	30,627	77,811	87,935
International | Firefighter Helmets & Protective Apparel
Revenue from External Customer [Line Items]
Revenues	15,265	5,785	42,984	19,812
International | Portable Gas Detection
Revenue from External Customer [Line Items]
Revenues	12,667	11,729	37,821	36,316
International | Industrial Head Protection
Revenue from External Customer [Line Items]
Revenues	7,782	7,839	24,702	25,711
International | Fall Protection
Revenue from External Customer [Line Items]
Revenues	10,480	11,511	34,005	31,522
International | Other
Revenue from External Customer [Line Items]
Revenues	$ 14,233	$ 19,033	$ 46,704	$ 56,580
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	22.00%	21.00%	21.00%	22.00%
International | Revenue Benchmark | Fixed Gas & Flame Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	23.00%	28.00%	23.00%	27.00%
International | Revenue Benchmark | Firefighter Helmets & Protective Apparel | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	14.00%	5.00%	13.00%	6.00%
International | Revenue Benchmark | Portable Gas Detection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	11.00%	11.00%	11.00%	11.00%
International | Revenue Benchmark | Industrial Head Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	7.00%	7.00%	7.00%	8.00%
International | Revenue Benchmark | Fall Protection | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	9.00%	11.00%	10.00%	9.00%
International | Revenue Benchmark | Other | Product Concentration Risk
Revenue from External Customer [Line Items]
Concentration risk percentage	14.00%	17.00%	15.00%	17.00%

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