Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net sales		$ 494,949	$ 394,875	$ 892,583	$ 725,360
Costs of goods sold		318,693	261,954	576,338	483,639
Gross profit		176,256	132,921	316,245	241,721
Operating expenses:
Selling and service		46,052	42,010	88,734	81,477
Research and development		12,616	10,553	24,469	20,840
General and administrative		26,639	21,407	50,114	42,380
Amortization of intangibles		5,482	7,129	11,114	14,312
Total operating expenses		90,789	81,099	174,431	159,009
Income from operations		85,467	51,822	141,814	82,712
Other (expense) income:
Interest expense		(11,002)	(10,893)	(21,115)	(21,681)
Investment income		367	38	713	43
Loss on extinguishment of debt	[1]	(1,332)		(1,332)
Costs related to acquisition		(26)	(136)	(37)	(321)
Other, net		(861)	(1,577)	(2,244)	(1,494)
Total other expense, net		(12,854)	(12,568)	(24,015)	(23,453)
Income before provision for income taxes		72,613	39,254	117,799	59,259
Provision for income taxes		18,382	13,878	29,798	21,701
Net income		54,231	25,376	88,001	37,558
Net income attributable to noncontrolling interests		970	85	1,095	92
Net income attributable to Generac Holdings Inc.		$ 53,261	$ 25,291	$ 86,906	$ 37,466
Net income attributable to common shareholders per common share - basic: (in dollars per share)		$ 0.83	$ 0.41	$ 1.25	$ 0.62
Weighted average common shares outstanding - basic: (in shares)		61,534,423	62,146,393	61,696,014	62,260,170
Net income attributable to common shareholders per common share - diluted: (in dollars per share)		$ 0.82	$ 0.41	$ 1.24	$ 0.61
Weighted average common shares outstanding - diluted: (in shares)		62,054,447	62,635,437	62,259,712	62,849,877
Comprehensive income attributable to Generac Holdings Inc.		$ 47,884	$ 32,208	$ 92,587	$ 47,928

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