Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net sales		$ 3,737,184	$ 2,485,200	$ 2,204,336
Costs of goods sold		2,377,102	1,527,546	1,406,584
Gross profit		1,360,082	957,654	797,752
Operating expenses:
Selling and service		319,020	246,373	217,683
Research and development		104,303	80,251	68,394
General and administrative		144,272	118,233	109,017
Acquisition related costs		21,465	1,411	1,851
Amortization of intangibles		49,886	32,280	28,644
Total operating expenses		638,946	478,548	425,589
Income from operations		721,136	479,106	372,163
Other (expense) income:
Interest expense		(32,953)	(32,991)	(41,544)
Investment income		1,415	2,182	2,767
Loss on extinguishment of debt	[1]	(831)	0	(926)
Loss on pension settlement	[2]	0	0	(10,920)
Other, net		2,759	(2,106)	(1,933)
Total other expense, net		(29,610)	(32,915)	(52,556)
Income before provision for income taxes		691,526	446,191	319,607
Provision for income taxes		134,957	98,973	67,299
Net income		556,569	347,218	252,308
Net income attributable to noncontrolling interests		6,075	(3,358)	301
Net income attributable to Generac Holdings Inc.		550,494	350,576	252,007
Other comprehensive income (loss):
Foreign currency translation adjustment		(41,030)	4,948	2,210
Net unrealized gain (loss) on derivatives		20,529	(14,285)	(13,855)
Pension liability adjustment		0	0	10,541
Other comprehensive income (loss)		(20,501)	(9,337)	(1,104)
Total comprehensive income		536,068	337,881	251,204
Comprehensive income (loss) attributable to noncontrolling interests		5,496	(364)	(635)
Comprehensive income attributable to Generac Holdings Inc.		$ 530,572	$ 338,245	$ 251,839
Net income attributable to Generac Holdings Inc. per common share - basic: (in dollars per share)		$ 8.51	$ 5.61	$ 4.09
Weighted average common shares outstanding - basic: (in shares)		62,686,001	62,280,889	61,926,986
Net income attributable to Generac Holdings Inc. per common share - diluted: (in dollars per share)		$ 8.30	$ 5.48	$ 4.03
Weighted average common shares outstanding - diluted: (in shares)		64,253,408	63,737,734	62,865,446

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

[2] Represents pre-tax settlement charges related to the termination of the Company’s domestic pension plan in the fourth quarter of 2019.