Segment Information, Segment Contribution (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Contribution [Abstract]
Operating income	$ 85,376	$ 58,074	$ 148,289	$ 94,639
Other income (expense)	(4,012)	1,581	(2,430)	(4,593)
Income before provision for income taxes	81,364	59,655	145,859	90,046
Operating Segment [Member]
Segment Contribution [Abstract]
Operating income	168,550	137,077	316,867	244,721
Operating Segment [Member] | Nu Skin [Member]
Segment Contribution [Abstract]
Operating income	169,285	137,162	317,867	248,807
Operating Segment [Member] | Mainland China [Member]
Segment Contribution [Abstract]
Operating income	51,480	43,668	90,919	81,055
Operating Segment [Member] | Americas/Pacific [Member]
Segment Contribution [Abstract]
Operating income	32,106	25,791	64,250	37,071
Operating Segment [Member] | South Korea [Member]
Segment Contribution [Abstract]
Operating income	28,892	24,090	55,417	48,189
Operating Segment [Member] | EMEA [Member]
Segment Contribution [Abstract]
Operating income	13,681	3,342	22,577	3,973
Operating Segment [Member] | Southeast Asia [Member]
Segment Contribution [Abstract]
Operating income	18,105	16,977	34,354	33,695
Operating Segment [Member] | Japan [Member]
Segment Contribution [Abstract]
Operating income	16,461	16,455	34,442	31,047
Operating Segment [Member] | Hong Kong/Taiwan [Member]
Segment Contribution [Abstract]
Operating income	8,560	6,839	15,908	13,777
Operating Segment [Member] | Rhyz Investments [Member]
Segment Contribution [Abstract]
Operating income	(735)	(85)	(1,000)	(4,086)
Operating Segment [Member] | Manufacturing [Member]
Segment Contribution [Abstract]
Operating income	6,764	5,402	12,590	8,251
Operating Segment [Member] | Grow Tech [Member]
Segment Contribution [Abstract]
Operating income	(6,980)	(5,487)	(13,071)	(12,337)
Operating Segment [Member] | Rhyz Other [Member]
Segment Contribution [Abstract]
Operating income	(519)	0	(519)	0
Corporate and Other [Member]
Segment Contribution [Abstract]
Operating income	$ (83,174)	$ (79,003)	$ (168,578)	$ (150,082)