Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net sales	$ 4,209,147	$ 4,295,834	$ 4,022,667
Costs of goods sold	2,597,410	2,630,208	2,657,236
Gross profit	1,611,737	1,665,626	1,365,431
Operating expenses:
Selling and service	555,358	526,446	448,199
Research and development	243,470	219,600	173,443
General and administrative	422,211	285,095	253,396
Amortization of intangibles	101,507	97,743	104,194
Total operating expenses	1,322,546	1,128,884	979,232
Income from operations	289,191	536,742	386,199
Other (expense) income:
Interest expense	(70,697)	(89,713)	(97,627)
Investment income	7,673	7,605	4,272
Change in fair value of investments	(20,610)	(38,006)	0
Loss on refinancing of debt	(1,225)	(4,861)	0
Other, net	(5,272)	(2,329)	(2,544)
Total other expense, net	(90,131)	(127,304)	(95,899)
Income before provision for income taxes	199,060	409,438	290,300
Provision for income taxes	37,706	92,460	73,180
Net income	161,354	316,978	217,120
Net income attributable to noncontrolling interests	1,800	663	2,514
Net income attributable to Generac Holdings Inc.	159,554	316,315	214,606
Other comprehensive income (loss):
Foreign currency translation adjustment	99,817	(62,842)	57,963
Net unrealized loss on derivatives	(12,863)	(7,672)	(8,004)
Other comprehensive income (loss)	86,954	(70,514)	49,959
Total comprehensive income	248,308	246,464	267,079
Comprehensive income attributable to noncontrolling interests	2,481	405	2,581
Comprehensive income attributable to Generac Holdings Inc.	$ 245,827	$ 246,059	$ 264,498
Net income attributable to Generac Holdings Inc. per common share - basic: (in dollars per share)	$ 2.73	$ 5.46	$ 3.31
Weighted average common shares outstanding - basic: (in shares)	58,523,642	59,559,797	61,265,060
Net income attributable to Generac Holdings Inc. per common share - diluted: (in dollars per share)	$ 2.69	$ 5.39	$ 3.27
Weighted average common shares outstanding - diluted: (in shares)	59,275,781	60,350,412	62,058,387