Segment Information, Segment Contribution (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Contribution [Abstract]
Operating income (loss)	$ 69,892	$ 80,675	$ 212,747	$ 222,429
Other income (expense)	(4,979)	(6,982)	(11,153)	(16,940)
Income before provision for income taxes	64,913	73,693	201,594	205,489
Mainland China [Member]
Segment Contribution [Abstract]
Operating income (loss)	48,619	71,185	158,873	189,901
Americas/Pacific [Member]
Segment Contribution [Abstract]
Operating income (loss)	12,875	11,848	41,314	38,088
South Korea [Member]
Segment Contribution [Abstract]
Operating income (loss)	24,770	24,754	76,417	75,836
Southeast Asia [Member]
Segment Contribution [Abstract]
Operating income (loss)	22,063	21,204	60,895	58,245
Japan [Member]
Segment Contribution [Abstract]
Operating income (loss)	16,287	15,162	46,216	41,777
Hong Kong/Taiwan [Member]
Segment Contribution [Abstract]
Operating income (loss)	8,063	8,100	24,754	23,781
EMEA [Member]
Segment Contribution [Abstract]
Operating income (loss)	1,529	2,614	6,114	10,438
Nu Skin [Member]
Segment Contribution [Abstract]
Operating income (loss)	134,206	154,867	414,583	438,066
Operating Segment [Member]
Segment Contribution [Abstract]
Operating income (loss)	132,961	154,180	412,148	436,056
Corporate and Other [Member]
Segment Contribution [Abstract]
Operating income (loss)	(63,069)	(73,505)	(199,401)	(213,627)
Manufacturing [Member] | Operating Segment [Member]
Segment Contribution [Abstract]
Operating income (loss)	4,577	2,045	11,598	4,039
Grow Tech [Member] | Operating Segment [Member]
Segment Contribution [Abstract]
Operating income (loss)	$ (5,822)	$ (2,732)	$ (14,033)	$ (6,049)