Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 25,791	$ (18,329)	$ 19,436
Other comprehensive income (loss), before tax:
Change in unrealized gains and losses on derivatives	30	834	(3,068)
Change in unrealized gains and losses on available-for-sale investments	16	128	(115)
Other comprehensive income (loss), before tax	46	962	(3,183)
Tax benefit (provision) related to derivatives	(6)	(76)	352
Tax benefit (provision) related to available-for-sale investments	(4)	(50)	42
Other comprehensive income (loss), net of tax	36	836	(2,789)
Comprehensive income (loss)	25,827	(17,493)	16,647
Comprehensive loss attributable to non-controlling interest, net of tax	0	(9,165)	0
Comprehensive income (loss) attributable to NETGEAR, Inc.	$ 25,827	$ (8,328)	$ 16,647