Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock, Common [Member]	Excess Purchase Price over Predecessor Basis [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2023	73,195,055
Balance at Dec. 31, 2023	$ 733	$ 1,070,386	$ (1,032,921)	$ (202,116)	$ 2,519,313	$ (15,143)	$ 2,340,252	$ 2,818	$ 2,343,070
Balance (in shares) at Dec. 31, 2023			(13,057,298)
Unrealized gain (loss) on interest rate swaps, net of tax						1,982	1,982		1,982
Foreign currency translation adjustment						(5,671)	(5,671)	(87)	(5,758)
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price (in shares)	297,091
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price	$ 2	(841)					(839)		(839)
Net share settlement of restricted stock awards (in shares)			(38,304)
Net share settlement of restricted stock awards			$ (4,306)				(4,306)		(4,306)
Share-based compensation		12,440					12,440		12,440
Net income attributable to Generac Holdings Inc.					26,232		26,232		26,232
Net income								177
Net income									26,409
Redemption value adjustment					(2,686)		(2,686)		(2,686)
Balance (in shares) at Mar. 31, 2024	73,492,146
Balance at Mar. 31, 2024	$ 735	1,081,985	$ (1,037,227)	(202,116)	2,542,859	(18,832)	2,367,404	2,908	2,370,312
Balance (in shares) at Mar. 31, 2024			(13,087,185)
Balance (in shares) at Dec. 31, 2024	73,785,631
Balance at Dec. 31, 2024	$ 738	1,133,756	$ (1,196,997)	(202,116)	2,844,296	(85,399)	2,494,278	3,165	$ 2,497,443
Balance (in shares) at Dec. 31, 2024			(14,173,697)						14,173,697
Unrealized gain (loss) on interest rate swaps, net of tax						(4,313)	(4,313)		$ (4,313)
Foreign currency translation adjustment						29,272	29,272	198	29,470
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price (in shares)	249,885
Common stock issued under equity incentive plans, net of shares withheld for employee taxes and strike price	$ 2	626					628		628
Net share settlement of restricted stock awards (in shares)			(63,604)
Net share settlement of restricted stock awards			$ (8,635)				(8,635)		(8,635)
Stock repurchases (in shares)			(716,685)
Stock repurchases			$ (97,454)				(97,454)		(97,454)
Share-based compensation		11,608					11,608		11,608
Net income attributable to Generac Holdings Inc.					43,840		43,840		43,840
Net income								438
Net income									44,278
Redemption value adjustment
Balance (in shares) at Mar. 31, 2025	74,035,516
Balance at Mar. 31, 2025	$ 740	$ 1,145,990	$ (1,303,086)	$ (202,116)	$ 2,888,136	$ (60,440)	$ 2,469,224	$ 3,801	$ 2,473,025
Balance (in shares) at Mar. 31, 2025			(14,953,986)						14,953,986