Segment Information - Revenue from External Customers by Products and Services (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from External Customer [Line Items]
Net sales	$ 499,696	$ 432,679	$ 462,463	$ 413,302	$ 495,358	$ 446,728	$ 447,299	$ 398,262	$ 1,808,140	$ 1,787,647	$ 1,527,953
Revenues									$ 1,808,140	$ 1,787,647	$ 1,527,953
Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									100.00%	100.00%	100.00%
Firefighter Safety
Revenue from External Customer [Line Items]
Net sales									$ 712,684	$ 684,224	$ 578,935
Firefighter Safety | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									39.00%	38.00%	38.00%
Detection
Revenue from External Customer [Line Items]
Revenues									$ 642,792	$ 634,915	$ 529,735
Detection | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									36.00%	36.00%	35.00%
Industrial PPE and Other
Revenue from External Customer [Line Items]
Net sales									$ 452,664	$ 468,508	$ 419,283
Industrial PPE and Other | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									25.00%	26.00%	27.00%
Americas
Revenue from External Customer [Line Items]
Revenues									$ 1,246,641	$ 1,235,594	$ 1,043,238
Americas | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									100.00%	100.00%	100.00%
Americas | Firefighter Safety
Revenue from External Customer [Line Items]
Net sales									$ 507,738	$ 501,676	$ 416,427
Americas | Firefighter Safety | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									41.00%	41.00%	40.00%
Americas | Detection
Revenue from External Customer [Line Items]
Revenues									$ 426,839	$ 419,312	$ 349,543
Americas | Detection | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									34.00%	34.00%	34.00%
Americas | Industrial PPE and Other
Revenue from External Customer [Line Items]
Net sales									$ 312,064	$ 314,606	$ 277,268
Americas | Industrial PPE and Other | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									25.00%	25.00%	26.00%
International
Revenue from External Customer [Line Items]
Revenues									$ 561,499	$ 552,053	$ 484,715
International | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									100.00%	100.00%	100.00%
International | Firefighter Safety
Revenue from External Customer [Line Items]
Net sales									$ 204,946	$ 182,548	$ 162,508
International | Firefighter Safety | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									36.00%	33.00%	34.00%
International | Detection
Revenue from External Customer [Line Items]
Revenues									$ 215,953	$ 215,603	$ 180,192
International | Detection | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									38.00%	39.00%	37.00%
International | Industrial PPE and Other
Revenue from External Customer [Line Items]
Net sales									$ 140,600	$ 153,902	$ 142,015
International | Industrial PPE and Other | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									26.00%	28.00%	29.00%