Segment Information - Percentage of Total Sales by Product Group (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 503,327	$ 474,116	$ 966,959	$ 895,456
Detection
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	201,376	193,835	382,218	354,906
Fire Service
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	161,892	163,306	321,164	313,922
Industrial PPE And Other
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 140,059	$ 116,975	$ 263,577	$ 226,628
Revenue Benchmark | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Revenue Benchmark | Detection | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	40.00%	41.00%	40.00%	40.00%
Revenue Benchmark | Fire Service | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	32.00%	34.00%	33.00%	35.00%
Revenue Benchmark | Industrial PPE And Other | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	28.00%	25.00%	27.00%	25.00%
Americas segment
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 341,451	$ 320,139	$ 666,689	$ 613,299
Americas segment | Detection
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	138,628	127,174	262,602	237,065
Americas segment | Fire Service
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	108,243	110,815	224,335	216,722
Americas segment | Industrial PPE And Other
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 94,580	$ 82,150	$ 179,752	$ 159,512
Americas segment | Revenue Benchmark | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Americas segment | Revenue Benchmark | Detection | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	41.00%	40.00%	39.00%	39.00%
Americas segment | Revenue Benchmark | Fire Service | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	32.00%	35.00%	34.00%	35.00%
Americas segment | Revenue Benchmark | Industrial PPE And Other | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	27.00%	25.00%	27.00%	26.00%
International segment
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 161,876	$ 153,977	$ 300,270	$ 282,157
International segment | Detection
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	62,748	66,661	119,616	117,841
International segment | Fire Service
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	53,649	52,491	96,829	97,200
International segment | Industrial PPE And Other
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Revenues	$ 45,479	$ 34,825	$ 83,825	$ 67,116
International segment | Revenue Benchmark | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
International segment | Revenue Benchmark | Detection | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	39.00%	43.00%	40.00%	42.00%
International segment | Revenue Benchmark | Fire Service | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	33.00%	34.00%	32.00%	34.00%
International segment | Revenue Benchmark | Industrial PPE And Other | Product Concentration Risk
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Concentration risk percentage	28.00%	23.00%	28.00%	24.00%