Segment Information, Segment Contribution (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Contribution [Abstract]
Operating income (loss)	$ 68,653	$ 58,990
Other income (expense)	(2,848)	1,207
Income before provision for income taxes	65,805	60,197
Mainland China [Member]
Segment Contribution [Abstract]
Operating income (loss)	59,167	44,817
Americas/Pacific [Member]
Segment Contribution [Abstract]
Operating income (loss)	12,019	9,172
South Korea [Member]
Segment Contribution [Abstract]
Operating income (loss)	25,668	26,201
Southeast Asia [Member]
Segment Contribution [Abstract]
Operating income (loss)	17,992	16,402
Japan [Member]
Segment Contribution [Abstract]
Operating income (loss)	14,106	13,238
Hong Kong/Taiwan [Member]
Segment Contribution [Abstract]
Operating income (loss)	7,474	7,846
EMEA [Member]
Segment Contribution [Abstract]
Operating income (loss)	1,351	4,754
Nu Skin [Member]
Segment Contribution [Abstract]
Operating income (loss)	137,777	122,430
Operating Segment [Member]
Segment Contribution [Abstract]
Operating income (loss)	137,794	120,816
Corporate and Other [Member]
Segment Contribution [Abstract]
Operating income (loss)	(69,141)	(61,826)
Manufacturing [Member] | Operating Segment [Member]
Segment Contribution [Abstract]
Operating income (loss)	3,646	(354)
Grow Tech [Member] | Operating Segment [Member]
Segment Contribution [Abstract]
Operating income (loss)	$ (3,629)	$ (1,260)