Segment Information - Revenue from External Customers by Products and Services (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenue from External Customer [Line Items]
Net sales	$ 510,913	$ 468,445	$ 474,116	$ 421,340	$ 499,696	$ 432,679	$ 462,463	$ 413,302	$ 1,874,814	$ 1,808,140	$ 1,787,647
Revenues									$ 1,874,814	$ 1,808,140	$ 1,787,647
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									$ 647,474	$ 712,684	$ 684,224
Firefighter Safety | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									34.00%	39.00%	38.00%
Detection
Revenue from External Customer [Line Items]
Revenues									$ 763,393	$ 642,792	$ 634,915
Detection | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									41.00%	36.00%	36.00%
Industrial PPE and Other
Revenue from External Customer [Line Items]
Net sales									$ 463,947	$ 452,664	$ 468,508
Industrial PPE and Other | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									25.00%	25.00%	26.00%
Americas
Revenue from External Customer [Line Items]
Revenues									$ 1,261,841	$ 1,246,641	$ 1,235,594
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									$ 446,245	$ 507,738	$ 501,676
Americas | Firefighter Safety | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									35.00%	41.00%	41.00%
Americas | Detection
Revenue from External Customer [Line Items]
Revenues									$ 501,784	$ 426,839	$ 419,312
Americas | Detection | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									40.00%	34.00%	34.00%
Americas | Industrial PPE and Other
Revenue from External Customer [Line Items]
Net sales									$ 313,812	$ 312,064	$ 314,606
Americas | Industrial PPE and Other | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									25.00%	25.00%	25.00%
International
Revenue from External Customer [Line Items]
Revenues									$ 612,973	$ 561,499	$ 552,053
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									$ 201,229	$ 204,946	$ 182,548
International | Firefighter Safety | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									33.00%	36.00%	33.00%
International | Detection
Revenue from External Customer [Line Items]
Revenues									$ 261,609	$ 215,953	$ 215,603
International | Detection | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									43.00%	38.00%	39.00%
International | Industrial PPE and Other
Revenue from External Customer [Line Items]
Net sales									$ 150,135	$ 140,600	$ 153,902
International | Industrial PPE and Other | Sales | Product concentration risk
Revenue from External Customer [Line Items]
Concentration risk (percentage)									24.00%	26.00%	28.00%