Segment Information, Segment Contribution (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Contribution [Abstract]
Operating income (loss)	$ 74,202	$ 82,764	$ 142,855	$ 141,754
Other income (expense)	(3,326)	(11,165)	(6,174)	(9,958)
Income before provision for income taxes	70,876	71,599	136,681	131,796
Mainland China [Member]
Segment Contribution [Abstract]
Operating income (loss)	51,087	73,899	110,254	118,716
Americas/Pacific [Member]
Segment Contribution [Abstract]
Operating income (loss)	16,420	17,068	28,439	26,240
South Korea [Member]
Segment Contribution [Abstract]
Operating income (loss)	25,979	24,880	51,647	51,081
Southeast Asia [Member]
Segment Contribution [Abstract]
Operating income (loss)	20,840	20,639	38,832	37,041
Japan [Member]
Segment Contribution [Abstract]
Operating income (loss)	15,823	13,377	29,929	26,615
Hong Kong/Taiwan [Member]
Segment Contribution [Abstract]
Operating income (loss)	9,217	7,835	16,691	15,681
EMEA [Member]
Segment Contribution [Abstract]
Operating income (loss)	3,234	3,069	4,585	7,823
Nu Skin [Member]
Segment Contribution [Abstract]
Operating income (loss)	142,600	160,767	280,377	283,197
Operating Segment [Member]
Segment Contribution [Abstract]
Operating income (loss)	141,393	161,058	279,187	281,874
Corporate and Other [Member]
Segment Contribution [Abstract]
Operating income (loss)	(67,191)	(78,294)	(136,332)	(140,120)
Manufacturing [Member] | Operating Segment [Member]
Segment Contribution [Abstract]
Operating income (loss)	3,375	2,348	7,021	1,994
Grow Tech [Member] | Operating Segment [Member]
Segment Contribution [Abstract]
Operating income (loss)	$ (4,582)	$ (2,057)	$ (8,211)	$ (3,317)