Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net sales		$ 4,564,737	$ 3,737,184	$ 2,485,200
Costs of goods sold		3,042,733	2,377,102	1,527,546
Gross profit		1,522,004	1,360,082	957,654
Operating expenses:
Selling and service		496,260	319,020	246,373
Research and development		159,774	104,303	80,251
General and administrative		194,861	144,272	118,233
Acquisition related costs		1,459	21,465	1,411
Amortization of intangibles		103,320	49,886	32,280
Total operating expenses		955,674	638,946	478,548
Income from operations		566,330	721,136	479,106
Other (expense) income:
Interest expense		(54,826)	(32,953)	(32,991)
Investment income		1,129	1,415	2,182
Loss on extinguishment of debt	[1]	(3,743)	(831)	0
Other, net		(424)	2,759	(2,106)
Total other expense, net		(57,864)	(29,610)	(32,915)
Income before provision for income taxes		508,466	691,526	446,191
Provision for income taxes		99,596	134,957	98,973
Net income		408,870	556,569	347,218
Net income attributable to noncontrolling interests		9,368	6,075	(3,358)
Net income attributable to Generac Holdings Inc.		399,502	550,494	350,576
Other comprehensive income (loss):
Foreign currency translation adjustment		(48,841)	(41,030)	4,948
Net unrealized gain (loss) on derivatives		38,494	20,529	(14,285)
Other comprehensive income (loss)		(10,347)	(20,501)	(9,337)
Total comprehensive income		398,523	536,068	337,881
Comprehensive income (loss) attributable to noncontrolling interests		11,179	5,496	(364)
Comprehensive income attributable to Generac Holdings Inc.		$ 387,344	$ 530,572	$ 338,245
Net income attributable to Generac Holdings Inc. per common share - basic: (in dollars per share)		$ 5.55	$ 8.51	$ 5.61
Weighted average common shares outstanding - basic: (in shares)		63,117,007	62,686,001	62,280,889
Net income attributable to Generac Holdings Inc. per common share - diluted: (in dollars per share)		$ 5.42	$ 8.30	$ 5.48
Weighted average common shares outstanding - diluted: (in shares)		64,681,357	64,253,408	63,737,734

[1] Represents the non-cash write-off of original issue discount and deferred financing costs due primarily to a voluntary prepayment of debt.